Park Tool RBS-25 Brush/Sponge Cartridges The Park Tool RBS-25 Brush/Sponge Cartridges come ready to be installed into the CM-25 Professional Chain Scrubber. It includes two sets of rotating brushes, two sponges and two wicking pads already installed in a composite cartridge. Just plug and play. Features Comes ready to install into the CM-25 Chain Scrubber Includes rotating brushes, sponges, and wicking pads Manufacturer's Part No: RBS-25 UPC: 763477006417 | Park Tool | Rbs-25 Brush/sponge Cartridges Replacement Cartridges For Cm-25 | Rubber