ESP stands for Elegant Simple Products
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and lower load Slider versions with low-friction plastic inserts typically used for intermediate cars (between battens)
Triple Block with Cam Cleat for controlled easing of a 4:1 or 5:1 purchasing system
Suitable as mast-base or lead blocks on small- to mid-sized boats
HARKEN 100 mm Aluminum Black Magic Loop Block, 3245 Fasteners & Hardware_Clips ESP stands for Elegant SimpleBlack Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. Offered in 57 150 mm sizes, with low load versions in 57 and 75 mm ranges. A center cage keeps Torlon roller bearings separated and parallel to reduce friction. The sheave center carries the primary load,