Feature: 1. Made of high‑quality materials, durable and practical. 2. Universally used for mountain bikes, road bikes and folding bikes. 3. Seat tube clamp device size, suitable for 25.4mm‑31.8mm/1‑1.25in. 4. Engineering plastic, high strength, not easy to skew when exposed to the sun, not easy to break in cold winter, strict wire joints are not easy to loosen. 5. Can bend and stretch, shrink on sunny days to reduce wind resistance, and stretch on rainy days to cover mud and water. 6. Type B requires that there is a circular hole at the bottom of the front fork of a mountain bike, the inner diameter of the hole is 20‑28mm, and the self‑added washer is greater than 28mm. Type A requires that there is a small round hole on the front fork of a road bike, and a cylindrical seatpost is required for the rear. Specification: Condition: 100% brand newItem type: Bicycle Mud GuardMaterial: engineering plasticsColor: blackSeat tube clamp device size: suitable for about 25.4mm-31.8mm/1‑1.25in. Suitable: mountain bike, road bike, folding bike general typeOptional type: A type, B typeA type size: Extension size: Approx. 420mm/16.5in Shrink size: Approx. 155mm/6.1in B type size: Extension size: Approx. 420mm/16.5in Shrink size: Approx. 155mm/6.1in Type A requirements: The front fork of the road car has a circular hole; Type B requirements: There is a large circular hole at the bottom of the front fork of a mountain bike, the inner diameter of the hole is 20-28mm, and a washer should be added for those larger than 28mm.. Package List: 1 Set x Bicycle Mud Guard1 Set x Bracket seat post1 x Accessory1 x User manual