Kromasil HPLC Guard Cartridge Kromasil 100-5 C18(w) 3mm ID, 5 St/Pkg

A cartridge: This is the expendable column packed with the same packing as the HPLC column the user intends to protect. It's 1 cm long. Cartridges are sold in 5 and 3 pack for analytical and semi-preparative columns, respectively.