I have :
8 pcs KSRPL3008HC Hot Ceramic Disc Cartridge (1 Piece), Brushed Nickel
2 pcs KSRPL3005HC Hot Ceramic Disc Cartridge (1 Piece), Oil Rubbed Bronze
2 pcs Kingston Brass KSRPLC3000CC Cold Ceramic Disc Cartridge (1 Piece), Raw
The ceramic disc cartridge is the heart of the faucet, controlling its temperature and water flow. Internally, two opposing discs made out of ceramic carbide rotate to control the flow of water. Because ceramic carbide is impervious to friction, it can last for many years before needing replacement.