Kayak Pulley Block constructed in heavy duty plastic material - super durable and strong, can withstand strong pull;Pre-assemble pulley kit sold in quantities of two; sheaves spin bearings has small friction;The ball bearings, the sheaves, and the cheeks are treated black carbon for superior UV resistance. Kayak Pulley Block constructed in heavy duty plastic material - super high quality and strong, can withstand strong pull Pre-assemble pulley kit sold in quantities of two; sheaves spin bearings has small friction The ball bearings, the sheaves, and the cheeks are treated black carbon for superior UV resistance Dimensions: L 2.2'' x W 1.2'' ; weight: 25g(each); Max. Rope Diameter: Approx. 8mm(0.3in) Package Contents 2 Pieces Kayak Pulley Kit; Great accessory for kayaking, boating and canoeing