The BJ60M is manufactured by Yonsha, and is a 1.5 bellow suction cup that has a diameter of 60 mm. It is made up of silicone rubber and nitrile rubber. There are models available in various sizes such as: 2.5~13 mm, 13.5~20 mm, 2.5~13 mm, 20~33 mm, 35~50 mm, and 50~75 mm.