Kum 306.44.22 Magnesium Ellipse 1-Hole Inner Sharpener Ellipse 1-hole inner sharpener is shatterproof and made of magnesium alloy Sharpener contain on a blister card The blades are made of high-carbon steel therefore long-lasting and very sharp Dynamic Torsion Action built into each blade makes for a smoother, cleaner cut Sharpener position pencil at more precise angle