PRO-USE 171 Mechanical Pencil for Drafting Equipped with Schnoke System: You can choose between 2 types: a writing sense, a delicate writing experience, and a stable writing experience Equipped with a safety slide mechanism: This mechanical pencil is resistant to breakage against pressure [Materials] Shaft: ABS resin / Clip: Chrome plated iron / Taper: Chrome plated on brass / Gripper: Chrome plated on brass Product Size: Maximum shaft diameter 0.4 x 5.7 inches (10 x 145.2 mm); Weight: 0.8 oz (23.1 g)