Set of 4, Tube Cutter Used This is a silicone tube for replacing the feed rollers and output rollers of ScanSnap S300/ScanSnap S300M/ScanSnap/ScanSnap S1300 S1300i. Silicone tube: Inner diameter 5mm, Outer diameter 9mm, Length approximately 24mm (with some variation) This is for replacing the deteriorated roller rubber of ScanSnap. There are two methods: complete disassembly or partial replacement by making a vertical cut. This can be used as is for complete disassembly, or by making a cut for partial replacement. Method for complete disassembly replacement: There are too many steps to write here, so please search the internet. There is no difference in normal use, and it takes time, but the appearance will be perfect. Method for partial replacement: 1. Remove the feed roller and output roller by making a vertical cut with a cutter and pulling them off. If hydrolysis has progressed, you will need to remove the stickiness with anhydrous ethanol and cotton swabs. 2. Make a vertical cut in the new tube and set it on the shaft of the feed roller and output roller, using the rotation of the power button. Some people use adhesive, but it is not necessary. Only those who want to can use adhesive. This is at the level of selling the surplus purchased by an individual, so the quality is different from what companies sell. If you are concerned about burrs, please purchase those. If the quantity is insufficient, a refund will be processed.