Normally, when you use a mechanical pencil, the lead wears down on the writing side first, so the lead gets progressively scratchier and sharper as
Mitsubishi Pencil Mechanical Pencil, KURU TOGA, Pipe Slide Model 0.5 mm, MITSUBISHI PENCIL (UNI)
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the kurutoga has a core rotation mechanism that continually rotates the pencil lead as you write. a spring-loaded clutch twists the lead incrementally
uni mechanical pencil kurutoga pipe slide model 0.5mm, black body (m54521p.24)
Uni Kuru Toga Mechanical Pencil - Pipe Slide - 0.5 mm - Pink
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Kuru Toga, Mechanical Pencils
The Kurutoga has a Core Rotation Mechanism that continually rotates the pencil lead as you write. A spring-loaded clutch twists the lead incrementally every time you lift the pencil from the paper. This allows a uniform wearing of the lead so that it always remains pointed. This is great for students! It gives you an amazingly thin line. In effect, you use only 50% of the lead Area that you were previously using with your old mechanical pencil.
Uni Kuru Toga Mechanical Pencil - Pipe Slide - 0.5 mm - Black