Harken Carbo Air blocks are made of tough reinforced composite in a size and style to fit any system. The patented high-strength, T2 Soft Attach block features composite sheaves that spin freely on Delrin® ball bearings with curved bearing races. They have no metal shackles or rivets, making them the lightest soft-attach blocks Harken has ever designed. All T2™ Soft Attach Carbo blocks are lashed or spliced through the load-bearing center of the block, decreasing the loads on the sideplates and acting as a safety backup for the system. Use for traveler controls, mainsheets and vangs, cascades, bridles, and other systems where small lightweight blocks are called for. T2 blocks come in single and double configurations and can be tied, spliced, or lashed to almost anything. A length of Spectra® line is included. Carbo Air blocks are a lightweight, strong and reliable fiber-reinforced composite construction. Ball bearings, sheave, and sideplates are UV-stabilized.