Features Ultra Lightweight Low friction 2-stage Orbital ball bearing system Highest working load in its class Low profile and compact High performance cleating Swivel shackle head for unlimited block rotation. Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points. Ultra low profile integrated becket. Single - Becket - Swivel Head Application Mainsheet systems on dinghies, sports boats and small keelboats to 9 m. Spinnaker sheets on dinghies, sports boats and small keel boats to 9 m. Halyard, Vang and Backstay application on boats to 8 m. Control line applications on larger yachts Ideal use for mainsheet systems and spinnaker sheets on dinghies, sports boats and small keel boats to 9 m. Also ideal with halyard, vang and backstay applications on boats to 8 m. Spinnaker sheets on sports boats and small keel boats (lateral lead blocks) Control line applications on larger yachts. Materials Ball bearings - High compression strength carbon black Acety