The Allen 30mm High Load Dynamic Double Block is equipped with a stainless-steel sheave for enhanced performance. This upgraded design allows for faster rolling speeds, higher working loads, and lower friction compared to blocks with a standard acetal sheave. With the ability to accommodate both rope and wire, this block is ideal for use in applications that require smaller diameter lines, such as dinghies, windsurfing, and kitesurfing. Dynamic Blocks from Allen feature a patented bearing system with twin rows of stainless-steel ball bearings on a stainless-steel rail, providing superior load-carrying ability and longevity. Additionally, the patented Ultra-Strap, unique to Allen's 20, 30, and 40mm Dynamic blocks, is strengthened through a coining process, making it more durable and rope-friendly. The block also features a large central rivet, reducing weight and allowing for a secure and rope-friendly attachment when used in a cascade system.