Kum 303.33.21 Polystyrene Ellipse Ice Inner Sharpener, Colors Vary Ellipse ice inner sharpener is shatterproof and made of polystyrene 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 Available in assorted colors