The Duncan Butterfly XT is the long spinning, bearing axle version of the ever popular Duncan Butterfly. The yo-yo is available in four bright colours and the ten pack of string is available in seven separate colours. The XT features a high speed ball bearing axle and wide body for easy string tricks. Whippet string is a high quality string made from 100% polyester for long spin times and string tricks, the string is type 6 so is slightly thinner than other strings on the market. Yoyo spec; Weight - 52g, Width - 36.5mm, Diameter - 55.9mm, Response System - Starburst.