Shape, Butterfly with sid bearing cap for string tricks, 1A, 3A Material, aluminium Weight,62 grams Shape, Butterfly with sid bearing cap for string tricks, 1A, 3A Material, aluminium Bearing, 12.7x6.35x4.75mm/0.25x0.5x0.187inch Weight,62 grams Outer Diameter (inches),54MM/2.15 inches Width, 43mm/1.7inches Response Type, Double O-Ring Gap Type, fixed