Flat Back Pearls 3mm Choose your Colors in Storage Box - 5000 piecesYou will receive 5000 pieces of 3 mm round, flat back acrylic pearls in a mixture of 10 colors of your choice (storage box included). The colors available can be viewed here. Leave a note telling us your color choices upon check out. If you would like to have more of some colors, let us know. For example, "white, silver, sky blue, 2 x black, red, 3 x gold, mint". The bead measures 3 mm in diameter, with a thickness of approximately 1. 5 mm. These