Usage Tips:Package Includes: There are 4 faucet cartridges (2 blue and 2 red) in the package, suitable for hot and cold water, with 4 screws (8mm). Please pay attention to the size of the picture before purchasing. Materials: The faucet coil is made of brass and ceramic, durable and rust-proof, and can be used for a long time. Unique Design: The switch has a smooth design, which is still smooth after repeated use. At the same time, the copper valve core can resist high temperature, acid and alkali and wear. Good Sealing: This faucet valve has a Easy-to-use black rubber lock washer to seal the faucet, prevent the faucet from running out and avoid replacing the faucet again, making your life easier. Widely Used: Universal size, suitable for 75% taps. Can be used for single point or double click. Ideal for bathroom and kitchen. But not all models are suitable, so please check the size in the photo carefully before purchasing to ensure it is compatible with your faucet. -Made of brass and ceramic, sturdy and durable . Works perfectly, no more dripping taps, can be used for a long time. -Blue turns clockwise and red turns counterclockwise. The highest temperature used is 90 degrees Celsius. -Did the job of stopping the kitchen faucet from leaking and saved a bomb by not having to replace the faucet. p > -Protection against calcification thanks to ceramic sealing discs.