70kg BUMPER PLATES PACKAGE: PAIRS of, 1x 5kg, 1x 10kg, 20kg Sourced from overseas factories who are also supplying some of the biggest names in Powerlifting and CrossFit sportsAs a fitness industry supplier we only use and select quality bumper plates that are designed to lastProduced using high grade virgin rubber these bumper plates have minimal bounce and less imperfections than other products we have tested. Fitted with Stainless steel inserts, we are yet to see these pop out even in harsh commercial environmentsThe collar opening is at 50.4mm and within a tolerance of +/-10g of claimed weight Our Olympic bumper plate diameter is as per IWF standard of 450mm or 17.72 inches5kg have a 6 month warranty, while the rest have a 18 month warranty under normal conditions