Harken 2149 40mm Carbo T2 Soft Attach Block with Open Centre. Harken´s Carbo T2™ is the first block with no fasteners, rivets, or other metal parts to add weight. Its composite structure makes T2 the lightest soft-attach block Harken has ever designed. Applied industrial design and new branding gives this patent-pending block a hot new look that appeals to racing sailors both young, and young at heart. T2 blocks have been tested by Harken-sponsored Olympic and world class sailors and received rave reviews for their flexibility, strength, and smooth operation, "Harken´s new soft-attach blocks are so light, smooth rolling, and dependable, I don´t even know they´re there," said Harken Speed Team sailor Andrew Campbell, a Star and Laser champion. Sheave diameter: 40mm Length: 57mm Weight: 25g Maximum line diameter: 10mm Maximum working load: 220kg Breaking load: 544kg