These glass rondels are vibrant and colorful and fun. They are hand-made in Istanbul, Turkey, so there is some variation of size as befits a hand-made bead. On average the beads are 10 mm wide and 3 mm thick. The bead channel will accommodate a 3 mm cord. The strands come in two colorways and you should choose which you prefer. One has more yellows and whites and overall looks lighter. The other has more sapphire and turquoise blue and appears a bit darker. Both strands are 12 inches long and have on average 100 beads.