SAKURA SumoGrip 0.5mm Mechanical Pencil Ergonomic Grip Gray Barrel A comfortable reliable mechanical pencil for all your writing drawing and drafting needs! SumoGrip s triangular cushion grip provides the ultimate comfort while the oversized barrel alleviates cramping over long-term use. Physical therapists recommend SumoGrip for patients with carpal tunnel and for adults with fine motor skill needs. The stylishly designed clear barrels showcase the internal mechanisms advancing the lead and eraser.