Low-friction Carbo AirBlocks from Harken are lightweight, strong, reliable and affordable. These compact single swivel blocks have very high working loads for safe and easy trimming no matter how hard the wind blows. Sideplates of high strength resin are UV stabilised to provide excellent protection against long term exposure to saltwater and sun. Carbo AirBlocks are 60% stronger and 30% lighter than our classic blocks making them perfect for the smaller diameter lines favoured by racers.

The compact 29mm Carbo is extremely strong. Use our miniature Carbo as a mainsheet block on small dinghies such as an optimist or for low-friction control line blocks on boats of any size. Use the 40mm Carbo for jiband mainsheet systems on high-performance dinghies and for loaded control lines on small keelboats. The high load 57mm Carbo has a broad working range. Use for main and jibsheets on centreboard and keelboat like lighnings, dragons, solings and j24's and for mainsheet systems on catamarans. The 75mm Carbo easily releases under load and is perfect for mainsheet systems on boats like the Melges 24, J/105 and Henderson 30.