MUQZI 2pcs Bicycle Front Fork Sponge Ring Oil Foam Absorb Seal 30/32/34/35/36/38/40mm Forks 30/32/34/35/36/38/40mm Mountain Bike Accessories. Body material: sponge. Product color: White. Product inner diameter: 30mm/32mm/34mm/35mm/36mm/38mm/40mm. Package size: about 120x80x10mm/4.7x3.15x0.4in. Net weight: about 3g. Function: it can effectively store oil, lubricate the front fork, avoid hard wear of the fork, and improve the service life.