By using a pencil extender you can use almost every bit of a wood case pencil before having to throw it away. It becomes a writing instrument by making shorter pencils feel more balanced as it allows for a better grip. Derwent Pencil Extenders are available in two sizes. The silver extender fits larger sized pencils, up to 8 mm, including Derwent Pastel, Color soft and Artists Pencils. The black extender is for use with standard sized pencils, up to 7 mm, including Derwent Graphic, Watercolor, and Studio. Both extenders have a robust screw fitting to hold the pencils securely and a soft touch coating on the barrel for improved grip.