This is a set of 4 silicone tubes for replacing the rollers of Fujitsu ScanSnap S1300/etc. Outer diameter 9mm, inner diameter 5mm, length approximately 22mm. If you make a cut in the deteriorated roller and remove it little by little with tweezers, etc., and then make a vertical cut in the new tube and insert it, the feed function will be restored. No disassembly is required. You can easily do it by referring to YouTube for instructions.