MATERIALS: polymer clay, rhinestones, silver tone metallic pendant base. 30 mm in diameter; weight 9 grams. Polymer clay item is not scratch resistant. I do not recommend to attach your piece to a keychain for this reason. It's better to keep your polymer clay item in a soft textile bag, separated from other accessories. Avoid applying hairspray while wearing your jewelry or accessory. To clean from dust - use very soft brush.