Uni Mitsubishi Hi-Uni 4H Pencil – Box of 12 | Extra Hard Graphite for Technical Drawing & Fine Detail

Uni Mitsubishi Hi-Uni 4H Pencil – Box of 12

Precision is not a preference — it’s a requirement. The Uni Hi-Uni 4H is engineered for artists, architects, and draughtsmen who demand razor-sharp lines, ghost-light marks, and a point that stays needle-fine through hours of detailed work. Significantly harder than H or 2H, the 4H grade deposits the lightest possible graphite trace — ideal for construction lines, technical grids, and underdrawing that disappears beneath ink or paint. Made in Japan by Mitsubishi Pencil Co., it brings the Hi-Uni’s legendary smoothness to the demanding world of hard-grade precision work.

✦ Key Features

• 4H Extra Hard Grade – Ghost-Light, Razor-Sharp Lines: Produces extremely fine, light marks with exceptional point retention — the go-to grade for technical grids, architectural construction lines, and precision underdrawing
• Surprisingly Smooth for a Hard Grade: Hi-Uni’s proprietary graphite formula eliminates the harsh, scratchy feel typical of hard pencils — delivering a controlled, smooth stroke even at 4H
• Outstanding Point Retention: The extra-hard graphite wears down extremely slowly, maintaining a fine tip far longer than softer grades — essential for sustained detail work without constant resharpening
• Break-Resistant Lead: Advanced core-bonding technology keeps the hard graphite core firmly centered in the casing, preventing tip snapping under the firm pressure often used in technical work
• Premium Japanese Cedar Casing: Sharpens to a needle-fine point cleanly and consistently; fine-grain cedar ensures a smooth, splinter-free sharpening experience every time
• Box of 12: Presented in the iconic Hi-Uni gold-foil box — a complete professional set for the drafting table, studio, or classroom

✦ Specifications

• Brand: Uni Mitsubishi (Japan)
• Model: Hi-Uni
• Grade: 4H
• Quantity: 12 pencils per box
• Best For: Technical drawing, architectural drafting, construction lines, precision underdrawing, engineering illustration
• Origin: Made in Japan

✦ Frequently Asked Questions

Q: What is the difference between 4H and H or 2H in the Hi-Uni range?
A: The higher the H number, the harder and lighter the pencil. H produces a light line; 2H is lighter still; 4H is significantly harder, producing an extremely fine, almost invisible mark with minimal graphite deposit. Artists use 4H when they need construction lines or underdrawing that will be erased or covered, and where any visible graphite residue would be a problem.

Q: Is 4H suitable for freehand sketching or only technical drawing?
A: While 4H is most commonly used in technical and architectural drawing, experienced fine artists also use it for initial underdrawing in graphite portraits and detailed illustrations — laying in light structural lines before building up tone with softer grades. It is less suited to expressive or gestural freehand sketching.

Q: Does the 4H feel scratchy on paper?
A: Hard pencils from lesser brands often feel harsh and abrasive, but the Hi-Uni 4H is notably smoother than competitors at the same grade. That said, all hard grades require a light touch on delicate papers to avoid scoring the surface — use smooth, heavier-weight paper for best results.

Q: Can 4H lines be erased cleanly?
A: Yes — hard grades like 4H erase more completely than soft grades because they deposit very little graphite. A quality vinyl or kneaded eraser will remove 4H lines with minimal residue, making it ideal for underdrawing that needs to disappear after inking.

Q: How does the Hi-Uni 4H compare to Staedtler Mars Lumograph 4H or Faber-Castell 9000 4H?
A: The Hi-Uni 4H is widely regarded as the smoothest hard-grade pencil in its class. Professionals in architecture, engineering illustration, and fine art consistently rate it above the Staedtler Mars Lumograph and Faber-Castell 9000 for graphite consistency and reduced scratchiness at hard grades.

Q: How many pencils come in the box?
A: Each box contains 12 Hi-Uni 4H pencils in Mitsubishi’s signature gold-foil presentation box.