The outer diameter of the motion state: 140 mm (5.51 inches). The outer diameter of the static state: 35 mm (1.38 inches). Shaft size: 6 mm (0.23 inches). Diameter: 40-50 mm (1.57-1.97 inches). Large: 45 mm (1.77 inches). Total length: 80 mm (3.15 inches).