Kum 400-1K Magnesium Alloy Metal 1-Hole Steel Blade Wedge Pencil Sharpener This 1-hole DTA tempered steel blade pencil sharpener is made of magnesium alloy metal 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 Metal sharpeners position pencil at more precise angle It comes in wedge shape