The Allen 30mm High Load Dynamic Triple Block features a stainless-steel sheave for faster rolling speeds, higher working loads, and lower friction. The unique bearing system uses twin rows of stainless-steel ball bearings on a stainless-steel rail for superior load-carrying ability and longevity. Additionally, the patented Ultra-Strap is strengthened through a coining process, making it more reliable and hard-wearing, while remaining rope-friendly. The block can also be paired with both rope and wire, making it ideal for use in a variety of high-load applications such as dinghies, windsurfing, and kitesurfing. Furthermore, the 20 and 30mm blocks offer a large central rivet for weight reduction and rope-friendly attachment, perfect for use in a cascade system.