1、This single rescue pulleys are great choices for anyone who need a quality-manufactured pulley for mountain rescue, tower work, ski patrol or whatever requires block and tackle system. 2、For hauling big load, large pulley is much more better and easier. 3、The black one is mounted with ball bearing for higher efficiency, stability and smoothness. 4、Concave pulley and polishing treatment on the surface for easy and rapid rope installation and remove. 5、Rating to 32KN for high durability to meet your needs. Features: This single rescue pulleys are great choices for anyone who need a quality-manufactured pulley for mountain rescue, tower work, ski patrol or whatever requires block and tackle system. For hauling big load, large pulley is much more better and easier. The black one is mounted with ball bearing for higher efficiency, stability  and smoothness. Concave pulley and polishing treatment on the surface for easy and rapid rope installation and remove. Rating to 32KN for high durability to meet your needs. Specifications: Condition: 100% Brand New and High Quality Material: Magnalium Alloy Size: Approx. 12.3 x 8.3 x 3cm / 4.8 x 3.2 x 1.2inch Still Tension: 32KN Rolling Tension: 16KN Bearing: Black: Ball Bearing; Blue: Copper Sleeve Bearing Suitable Rope Diameter: Maximum 15mm / 0.6inch Weight: Approx. 260g Package Included: 1 x Single Pulley NOTE: Please check it carefully for safety regulary&each time before using. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.