Kum 102.04.21 1-Hole Dome Shape Inner Pencil Sharpener, Colors Vary 1-Hole inner pencil sharpener is made of plastic The blade is protected against rust by polishing, cleaning, oil coating, etc 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 Comes in dome shape and three assorted colors