Roller Skate Floating Locket Charm - Old School Geekery TM Brand Lockets and Charms - Small Charm for Glass Locket &ndash; Derby Girl Old School Geekery TM Brand Floating Locket Charms and Accessories fit all major brands of Floating Lockets and Glass Lockets Floating Locket Charms have an average size of 7mm in diameter and 3mm in width. High Quality and Affordable! A unique and special addition to your floating locket collection! Floating Locket Charms are Small, they are intended only for use in glass lockets. They are not beads or pendants.