Low friction rings for various rope diameters, The PTFE coating seals each unit creating an extremely low friction surface. Friction is only increased by 15% compared to a plain bearing block. Up to 250% stronger, constructed from HE30 marine grade aluminium and anodised to 40 microns. Up to a 90% reduction in weight   Line Diameter Bore Diameter Overall Diameter  Working Load  Weight 3mm 7mm 14mm 350kg 0.7g 4mm 10mm 17mm 650kg 1.5g 6mm 12mm 23mm 1350kg 3.1g 10mm 18mm 33mm 2400kg 10.2g