RISK แหวนซิลิโคน ป้องกันน้ำ ฝุ่น หลักอานจักรยาน

After riding in the rain or cross-country, the seat post will  be full of sand and dust, it will scratched when you adjust it.But if you have it, all is different. High elasticity, more closer to seat post. Compatible with most of seat post. If you don't know your seat post size, you can buy 2 of them, combination to use. Color: red, black, blue, white Material: soft silicone  Size: Small: 25-30 (for 25.4/27.2mm diameter of seatpost); Large: 30-34 (for 30.4/30.8/30.9/31.6/33.9mm diameter of seatpost).  Package Contents: 1 x Bike Seat Post Dust Cover