Features： 1、Oil Resistant: The sponge is made through a 5 time hot compression molding process, resulting in a high density sponge that is resistant to oil and solvents. This ensures durability and longevity of the front fork. 2、Seamless Cutting: Unlike traditional cutting methods, this sponge is non modular and has no seams on its surface. The tolerance rate is less than 0.1, ensuring a fit and performance. 3、Visual Inspection: The sponge allows for easy visual inspection of the front fork's condition. Dryness of the sponge indicates oil loss and the need for increased lubrication. The presence of black sludge suggests increased metal wear, necessitating proper maintenance. 4、High Performance: The use of the sponge improves the front fork's shock absorption capabilities, resulting in a smoother and more comfortable riding experience, reducing vibrations and impacts on the rider's arms and hands. 5、Versatile Application: Sponge rings are compatible with a wide range of bicycles, including mountain bikes, road bikes, and folding bikes. This makes it a versatile choice for riders of different preferences and needs. Specification： Item Type: Bicycle Ring Oil Sealed Foam Material: Sponge Package List： 2 x Sponge Rings