Study compass is made of metal and designed ergonomically for years of comfortable use! Comes with a pencil, making it perfect for students of all ages. Universal holder works with any standard pencil or pen. Comes with pencil and in shatterproof case for safe keeping. Draws up to 10" diameter circles.Details:Metal4.8 in.Includes pencil and shatterproof caseDraws 10" circlesErgonomic