Overall length is 12 1/4 inches, sizing portion is 9 inches long This mandrel is solid aluminum, and weighs 9.6 ounces The surface is anodized for increased durability and scratch proofing Size markings are scored and painted white for greater visibility Measures sizes 1 - 15 in quarter size increments Just like they use in jewelry stores, this solid black anodized aluminum mandrel is scratch proof. It measures ring sizes 1 - 15 in quarter size increments. Measurements are scored into the metal and painted white for increased visibility. The overall length is 12.25", with a 3.25" handle and a 9" working surface.