The Brother PRK-A3001 is a roller replacement kit for standalone document scanners. The pack includes: Separation Roller x 1, Pick-up Roller x 2, Brake Roller x 1 The Brother PRK-A3001 accessory is recommended for use with the ADS-2200 and ADS-2700W document scanners only. The roller life is rated at 100,000 sheets and is recommended to replace all rollers at the same time once reached.