This kit contains 27 sizes and 216 pieces of 90A Durometer O-rings for Boss, Split Flange, and Flat Face hose end fittings and adapters. Each box has a graphic label identifying the type of application and dash number for the seal. A chart on the back of the box lists popular OEM part number matches for each O-ring. (John Deere, Caterpillar & J.I. Case)