Five April Birthstone for Snake Chain Charm Bracelet Quantity: 5 Charm Material: Zinc Metal Alloy, Silver Base Metal Size: Hole of the charms is 4.7mm slide on Core (not threaded) Fits: All major Brand Bracelets, such as Pandora, Troll, Chamilia, Carlo Biagi, Zable, and other add-a-bead bracelets.