HOUSWEETY 1PC Gunmetal Living Memory Locket For Floating Charms 3.5cmx3cm Main Material:Zinc Metal Alloy+Glass;Main Color:Gunmetal Approx:3.5cm x3cm;hole size:3.6mm;Thickness:9.2mm( 3/8"); Environmental protection,beautiful appearance,light weight,convenient installation.Beware of swallowing by children. perfect DIY jewelry making charms;can be opened and add little crafts as you like Perfect findings for a variety of jewelry making. Every findings has its unique design and style and theme, hence the jewelry made with them are unique and represent your own fashion.