These are hotfix rhinestone round shape crystal glass loose beads.SS16 size, approx 4mm, pretty small, 12 facets, a pack of 720 pieces.Glue is already on the back,easy to apply: Fabrics - just position them and lay a hot iron on them - Depending on the heat of your iron, it may take a few seconds.Use double sided tape or additional glue without heat works fine also.Use on:Belts, clothes, shoes, wood projects, backpacks, glasses, Jeans, cellphone cases, tablets, hairpin,wedding dresses...you name it...It can be personalized, create your own design.Warm note: please apply carefully and safely,and item is small not suitable for children under 3 years old.