The Korda Size 8 and Size 11 PTFE COATED QC RING SWIVELS have been designed to allow anglers to quickly change hook lengths whilst maintaining a strong and reliable connection. The PTFE (Polytetrafluoroethylene) coating is a synthetic polymer which has one of the lowest coefficients of friction of any solid. 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.