{"product_id":"uni-mitsubishi-hi-uni-10h-pencil-box-12-technical-drafting","title":"Uni Mitsubishi Hi-Uni 10H Pencil – Box of 12 | Hardest Graphite for Instrument-Grade Drafting \u0026 Ghost Underdrawing","description":"\u003ch2\u003eUni Mitsubishi Hi-Uni 10H Pencil – Box of 12\u003c\/h2\u003e\n\u003cp\u003eThe hardest graphite pencil Mitsubishi makes. The Uni Hi-Uni 10H occupies a category of its own — a specialist instrument for professionals who operate at the absolute limit of graphite precision. The 10H grade produces a mark so fine and so faint it is virtually indistinguishable from the paper surface itself, making it the definitive choice for instrument-grade technical drafting, micrographic scientific illustration, and ghost underdrawing where zero graphite presence in the finished work is non-negotiable. Made in Japan by Mitsubishi Pencil Co. to the exacting standards the Hi-Uni name demands, this is not a pencil — it is a precision instrument.\u003c\/p\u003e\n\n\u003ch3\u003e✦ Key Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10H – The Hardest Grade in the Hi-Uni Range:\u003c\/strong\u003e The most extreme hard grade Mitsubishi produces, the 10H deposits a mark at the absolute threshold of graphite visibility — reserved for instrument-grade technical drafting, micrographic illustration, and underdrawing where no graphite trace can remain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Smoothness at Maximum Hardness:\u003c\/strong\u003e Hi-Uni’s proprietary graphite formula is pushed to its engineering limit at 10H — delivering a controlled, consistent stroke that minimizes surface abrasion and paper damage even at this extreme hardness\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnrivalled Point Retention:\u003c\/strong\u003e The 10H wears at a near-imperceptible rate, maintaining a needle-fine tip through the longest, most demanding precision work sessions without resharpening\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBreak-Resistant Lead:\u003c\/strong\u003e Advanced core-bonding technology keeps the hard graphite core firmly anchored in the cedar casing — essential at extreme hard grades where tip snapping under firm, sustained pressure is the primary failure mode of lesser pencils\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium Japanese Cedar Casing:\u003c\/strong\u003e Sharpens to an ultra-fine point cleanly and consistently; fine-grain cedar ensures a smooth, splinter-free sharpening experience every time\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBox of 12:\u003c\/strong\u003e Presented in the iconic Hi-Uni gold-foil box — a complete professional set for the scientific illustration studio, instrument drafting room, or specialist fine art practice\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e✦ Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Uni Mitsubishi (Japan)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Hi-Uni\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGrade:\u003c\/strong\u003e 10H\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 12 pencils per box\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBest For:\u003c\/strong\u003e Instrument-grade technical drafting, micrographic scientific illustration, precision cartography, ghost underdrawing for watercolor and ink, engineering diagram construction lines\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e✦ Frequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 10H and 8H in the Hi-Uni range?\u003c\/strong\u003e\u003cbr\u003e\nA: Both are extreme hard grades, but 10H is the hardest grade Mitsubishi produces — two steps harder than 8H. The 10H deposits a mark so faint it is barely distinguishable from the paper surface under normal lighting. Where 8H is used for demanding precision work, 10H is reserved for applications where even an 8H line would be considered too visible — such as micrographic illustration, instrument-grade drafting on coated surfaces, or underdrawing for fine art where zero graphite residue is essential.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Who uses a 10H pencil?\u003c\/strong\u003e\u003cbr\u003e\nA: The 10H is an extreme specialist tool used by a small community of professionals: scientific illustrators working on botanical, anatomical, or geological diagrams at micro scale; cartographers producing the finest possible linework; engineers and architects working on instrument-grade construction grids; and fine artists who require completely invisible underdrawing beneath watercolor, gouache, or ink. It is not a general-purpose drawing pencil.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does the 10H damage paper?\u003c\/strong\u003e\u003cbr\u003e\nA: At extreme hard grades, scoring or embossing paper is a genuine risk if heavy pressure is applied. The Hi-Uni 10H is engineered to minimize surface abrasion, but a very light, consistent touch is absolutely essential. Always use smooth, heavyweight paper — Bristol board, hot-press watercolor paper, or professional drafting film — and never apply pressure beyond what is needed to produce a visible mark.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can 10H lines be erased completely?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes — the 10H deposits so little graphite that it erases almost completely with a quality vinyl eraser, leaving virtually no visible residue. This makes it the ideal grade for underdrawing in watercolor and ink illustration where a completely clean, graphite-free surface is required after the structural lines have served their purpose.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How does the Hi-Uni 10H compare to other brands?\u003c\/strong\u003e\u003cbr\u003e\nA: The 10H grade is produced by very few pencil manufacturers in the world. The Hi-Uni 10H is the benchmark — offering a level of graphite consistency, smoothness, and break resistance at this extreme hardness that no other brand reliably matches. For professionals who require a 10H, the Hi-Uni is effectively the only choice.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How many pencils come in the box?\u003c\/strong\u003e\u003cbr\u003e\nA: Each box contains 12 Hi-Uni 10H pencils in Mitsubishi’s signature gold-foil presentation box.\u003c\/p\u003e","brand":"Uni Mitsubishi","offers":[{"title":"Default Title","offer_id":46594782330914,"sku":"HI-UNI-12-10H","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0902\/3045\/6354\/files\/HI-UNI-PENCIL-12-PACK-10H.jpg?v=1787822135","url":"https:\/\/www.xypen.com\/products\/uni-mitsubishi-hi-uni-10h-pencil-box-12-technical-drafting","provider":"XYPen","version":"1.0","type":"link"}