Note: 3 sizes are offered， please choose number to get size you want.<br />Diameter: (10):13x18mm; (12): 16x21mm; (14): 18x22mm; (24): 20x24mm; (29): 28x39mm; (34): 31x40mm; (40): 45x48mm; (45): 50x56mm <br /><br />Features:<br />Made of plastic material，