These training bumper plates are made of recycled rubber providing excellent flooring protection in your gym york rubber coloured bumper plates 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 key features of the york rubber coloured bumper plates strong and durable very a