3 mm Genuine Swarovski Crystal rhinestone, in an adorable metal bezel and with a loop shank. World's smallest button. Use in knitting, crochet, string for a dazzling look. 20 of them pack into about 1.25 inches when strung. Loop is 2 mm across and about 1.3 mm deep. Or stick into epoxy clay. So cute!
4mm By the pack of 20.