Clayvision Tennis Ball (Flat) Charm Zipper Pull for bracelets & decoration Original Clayvision design. Charm measures about 1/2 inch tall. Charm comes on a small lobster clasp to attach to many items like jackets, bags, backpacks, bracelets, etc. for decoration. Pewter charm is nickel plated and manufactured in the United States. Not recommended for children under 3 years of age or for pets.