The pulley spare parts set for your Colab Chain Tensioner. For replacing damaged or worn out pulleys. The set contains one upper and one lower pulley. Features: - Compatibility: with 9/10/11spd chains and 13 - 17T sprockets - Weight: 24 g (+/- 5 % weight tolerance) - Sprocket Sizes: 11, 11 tooth - Industrial bearing - Material: plastic / aluminium