With a sheave size of 29 mm and a compact length of 53 mm, Harken's Low-friction Carbo Air blocks have a maximum working load of 150 kg and can handle lines up to 8mm in size. Weighing only 17 g, these blocks are known for their lightweight design and high strength, making them a reliable and affordable choice for various sailboat applications. Whether used for Flying Scot Downhaul blocks, I14 Shroud Tensioning Systems, or Thistle Traveller Blocks, these blocks offer safe and effortless trimming, with a breaking load of 454kg.