YOYO Shape, Butterfly for string Trick Material, ABS Color:Glow in dark YOYOShape, Butterfly for string TrickMaterial, Aluminum Bearing, 5x11x5, kkWeight 68 grams Outer Diameter (inches) 52mm/2.05 inches Width 41mm/1.61 inches Response Type, Double O-Ring O-Ring Type, Flat Silicone O-Ring Gap Type, Fixed Gap