This is a disc type flexible coupling. Stainless steel plates allow for eccentricity, misalignment and end clearance. The outer diameter of φ15-φ104 and the inner diameter of φ3-φ50 vary greatly. XBW Flower drum adopts high strength XBW Extra duralumin (A7075) among aluminum alloys. XBWS is an all-stainless steel type with stainless steel wheels.