Carl Pencil Sharpener CP-100 Violet. Manual, Portable & Quiet for School, Office & Home Desk. Two lead tip thickness choices at sharpened end - 0.5mm or 0.9mm diameter. Clutch automatically draws pencil in and stops sharpening when chosen 0.5mm or 0.9mm tip is achieved. Clutch clamping teeth are rubber, protecting pencil surface from mars. Quiet operation -- just avoid using on a resonating surface! Light and portable. For graphite or colored pencils. Use 9mm (blunt) setting for colored pencils.