Harken Carbo AirBlocks TiLite Block low-friction Carbo AirBlocks® are light, strong and reliable. Carbo AirBlocks TiLite Harken Blocks are small, compact blocks that work at very high speed and durability for safe, simple trimming are no matter how hard the wind is blowing. The Harken Carbo AirBlocks TiLite’s ball bearings, washers and faces are UV-stabilised and provide long-term protection against saltwater and the sun.