The Korda Size 8 and Size 11. The PTFE COATED QC RING SWIVELS will be added to our range of end tackle and will not replace our existing QC RING SWIVELS. 8 PTFE COATED QC RING SWIVELS. This makes it the perfect coating for our swivels as it reduces friction between the barrel and swivel eye, allowing them to rotate freely which reduces tangles.