UNI-BALL KURU TOGA SELF-SHARPENING Automatic Mechanical Pencil M5-450T 0.5mm HB Smoke Barrel 0.5mm HB The Uni-Ball Kuru Toga Mechanical Pencil with Revolving Lead that Keeps the Lead Tip Sharp When using a normal mechanical pencil at a typical writing angle, the lead point quickly becomes chisel-shaped. This leads to broader, less precise lines; and crumbling of the resulting sharp edge. The unique gear mechanism of the Kuru Toga rotates the lead every time it is touched to the paper, resulting in a clean cone-shaped tip which is sharp and resistant to breaking. Simple, yet brilliant! Its a 0.5mm pencil with a fixed lead sleeve. 143mm long, approx 10mm diameter and 10g in weight. The polycarbonate barrel has a gently ridged grip section through which you can clearly see the 3-gear rotation mechanism in operation. The logo on the centre gear rotates visibly each time the tip is pressed to the writing surface. The lead rotates approximately 9 degrees with each contact - around 40 touches will rotate the lead completely There's a replaceable eraser under the push-button. Supplied with 3 HB Uni Nano Dia leads - which are another innovation - being stronger than any previous lead due to some clever nano-technology -  Uni Nano-Dia Leads are the very latest in pencil lead technology. 400 million 'nano-diamonds' per lead improve smoothness and strength and high viscosity oils improve smoothness and darkness Refill Leads and Replacement Erasers Available Only £4.99 + FREE POSTAGE