|  Details Make the Difference
Black Magic® blocks envolved from the first AirBlocks® developed in 1992 for top level syndicate racers. Using Finite Element Analysis to remove excess material, our engineers produced a block optimized for maximum strength-to-weight.
Today these low-friction, efficient, and easily-maintained blocks are used on boats from club racers to the most elite racing machines.
1. Isolated Metals Plastic isolators between dissimilar metals prevent corrosion.
2. Protective Finish Black Hardkote anodizing for scratch-resistant UV protection. Three times tougher than gray.Strong, Lightweight Sideplates Aluminum sideplates are sculpted for superior strength-to-weight ratio. Edges are radiused to protect line.
3. Caged Rollers Torlon® roller bearings are separatedto prevent racking and reduce friction.
Select the appropriate Harken block with the Big Boat Block Use Chart
Read about Harken Big Boat Blocks | Harken Big Boat Blocks Technical Information
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