Product Description:

Material: Silicon, 100% nature rubber

Size: 11(280 mm), 12(310 mm), 13(330 mm), 14(350 mm), 15(380 mm),
16(410 mm), 17(430 mm), 18(450 mm), 19(480 mm), 20(510 mm),
21(530 mm), 22(550 mm), 24(610 mm), 26(650 mm), 28(710 mm)

Characteristics:
1. Slient and judder free operation
2. Easy to install, you can choose any size you want(DIY)