This filter is compatible with all models of Keurig coffee machines, including K-Slim, K-Supreme, K-Duo, K-Classic, K-Elite, K-Cafe, K-Compact, K-Express, 2.0 and 1.0 series models. It needs to be used with the corresponding water filter handle. It is made of NSF-certified organic coconut shell activated carbon filter material, which can remove impurities, calcium, chlorine and odors, reduce scale, and extend the machine's service life. It has undergone dust-free and sterilization treatment, is packaged independently, and comes with a storage box. The installation is simple. It is recommended to replace it once every 1-2 months. Material: Other.