Self-Adhesive: These flat back rhinestone are made of acrylic which has sticky back. No need to use glue and just peel and stick! Package Include: These beautiful round gems includes 45 pcs (3 sizes) of flat back rhinestones in crystal clear, and a transparent plastic storage box to contain them, enough to decorate a DIY craft. Size Reference: Flat back round acrylic rhinestones-Big: about 1.18"x0.24"/30x6mm; Medium: about 0.98"x0.24""/25x6mm;Small: about 0.79"x0.24"/20x6mm. Container: about 6.5"x3.35"x0.63"/165x85x16mm. Exquisite Design: Each rhinestone is glittering with precision cut multi-faceted, serve as beautiful ornaments and shine under the illumination of lights. Suitable For: These flat back rhinestones are suitable for jewelry making, fabric embellishments, commercial displays, party supplies, props, and theatrical performances. Very popular as as costume gems for cosplay.