The nail art decoration kit are made of quality and safe material, they are non-toxic, safe to you nail and skin, suitable for both adults and children. Multi-uses-- for bags, garment, nail art, shoes, cell phone, box, pen, furniture, greeting cards, etc The bright color and cute patterns will not fade or break easily, perfect match with other nail art deco,you can spread put these to deco your five nails. How to apply 3D nail art metal charms: 1. Apply an appropriate amount of the glue on the nail. 2. Use the tweezer to place the studs where you want. 3. Dry the glue with UV/ LED lamp for 2 minutes. 4. We recommend to apply one more layer of the glue on top so that the studs are more stable on the nail, also dry it with the lamp. 5. Apply a top coat or gel sealer and dry it in lamp. Note: The glue is not included. The colors may exist slight difference due to different screens. The nail studs are relatively small, please keep away from kids to prevent choking hazard.Wide Applications: You can use these ab crystals gems to decorate your phone, nail art, card crafting, shoes, wedding dress, books, guitar, tablets, car plates, table scatter and so on. Enough shine: It has a beautiful shape and a beautiful cutting surface. the lasting color can change with the movement. it is very shiny, making you more elegant and charming. Unique Design : The professional nail art design decoration, perfectly fit for nail studios, professional nail art specialist, nail tech, nail art learner or nail DIY lovers. Mixed Sizes: 3*4mm(10pcs),4*5mm(10pcs),3*7mm(10pcs),4*9mm(10pcs),4*6mm(10pcs). Good Quality: Made of Alloy, it is lightweight and durable, featured with nice shapes and beautiful cutting facets, good as nail art delicate decorations.