Based on world famous Butterfly®, Butterfly XT™ features modern yo-yo technology such as a large ball-bearing axle for long spin time (10x longer than the original), starburst response for quick returns, and its take-apart design allows for easy knot removal! These features make Butterfly XT perfect for a beginner-intermediate yo-yo player looking for high performance and quality at an economical price!> Weight 52 Grams Width 36.5 mm Diameter 55.9 mm Bearing Size C