Buzz Freewheels combine durability with lightning-fast engagement Tested extensively by the Dutch National BMX Team, Damien Godet, Kory Cook, and numerous other elite racers Features 9 super durable pawls and chromoly construction Compatible with 1/2` and 3/32` chains 1.375 x 24 TPI hub threading 18T x 3/32` Single Chromoly BlackUPC/EAN/GTIN: 639266092070