Materials: stainless steel 2 Styles of Chastity Cage Optional: S cage and L cage. S cage: Device Full Length:55mm/2.16inch Penis Tube Diameter:32mm/1.26inch Above sizes is fixed,what you can choose is the Base Ring Size. Base Ring Size:40mm/45mm/50mm(1.57inch/1.77inch/1.97inch) L cage: Device Full Length:65mm/2.56inch Penis Tube Diameter:32mm/1.26inch Above sizes is fixed,what you can choose is the Base Ring Size. Base Ring Size:40mm/45mm/50mm(1.57inch/1.77inch/1.97inch) For Both Style Cage,Base Ring Options you can choose: 40mm ring(1.57inch) 45mm ring(1.77inch) 50mm ring(1.97inch) 40mm ring+45mm ring (1.57inch+1.77inch) 45mm ring+50mm ring(1.77inch+1.97inch) The reason I offer 2 sizes base ring is to let customer can has 2 sizes ring to try,especially good for the beginers because they are not sure which size would fit them the best. Need other size base ring with this cage,select “customize size” to place order