These training bumper plates are made of recycled rubber providing excellent flooring protection in your gym york 170 kg olympic coloured rubber bumper plate set allows users to identify the different weight increments york is a company built on history since 1932 when bob hoffman founded york barbell from yorks foundations in the decades of the 1930s through to the 1970s york flexed its muscle with its olympic lifting teams york 170 kg olympic coloured rubber bumper plate set includes 2