Harken's Carbo AirBlocks are 30% lighter with 60% higher working loads than Harken's Classic blocks. These small, compact blocks have very high working loads for safe, easy trimming no matter how hard the wind blows.
They are perfect for the small-diameter main and jib sheet line favored by centerboard, small keelboat, and multihull racers. Their sideplates are constructed of lightweight, UV-stabilized, Nylon resin that has been reinforced with densely packed fibers. The Carbo AirBlocks have grooved races, which gives these small blocks greater load capacity.