NIUNIU Precautions for measuring dimensions Due to the long use time, the surface of the pulley will be worn to a certain extent When measuring the diameter of the pulley, be sure to measure to the outermost side of the nylon pulley Swing double wheels, flexible use The pulley is made of nylon and is equipped with large bearings for smooth use color: grey Size: Wheel diameter 19mm Package Contents: 4pcs old-fashioned arc shower pulley Warm prompt: 1.As different measuring methods,it will occur 1-3 cm deviation about the items,please ensure that it is okay for you before ordering. 2. Because of different monitors and lamplight, the picture may not reflect the actual color of the item, really thank you for your kind understanding 3. Only the above package contents, excluding other products.