The Allen 30mm Dynamic Block is optimal for tasks requiring consistent sheave movement. Our patented bearing system, featuring twin rows of stainless-steel ball bearings on a stainless-steel rail, provides superior load-carrying capabilities and durability compared to other systems that utilize plastic rails. Our 20, 30 & 40mm Dynamic blocks also incorporate our patented Ultra-Strap, which uses a unique coining process to strengthen the strap and increase its resistance to wear. Additionally, the Ultra-Strap is designed to be extremely rope-friendly. Our 20 & 30mm blocks also feature a large central rivet that reduces weight and offers a convenient attachment point for ropes and can be used in cascade systems.