880 LFA Low Friction Acetal Resin - Plates in self-lubricating low friction acetal resin, light brown-coloured. - Pins in chrome-nickel austenitic stainless steel (18% Chrome - 8% Nickel), work hardened for high resistance. 880 WR Wear Resistant resin - Plates in thermoplastic wear resistant resin, black-coloured. - Pins in chrome-nickel austenitic stainless steel (18% Chrome - 8% Nickel), work hardened for high resistance.