This is the only articulating triple block on the market, providing free articulation between blocks for optimal rope alignment. Its low friction design allows for fast rolling speeds, making it great for smaller diameter lines in dinghies, windsurfing, kitesurfing, and other applications. The patented bearing system features twin rows of stainless-steel ball bearings on a stainless-steel rail for superior load-carrying and longevity. In addition, our patented Ultra-Strap is coined for added strength and is more rope-friendly than other designs. The 20 and 30mm blocks also feature a large central rivet for weight reduction and a rope-friendly attachment point in cascade systems.