<https://www.championseating.com/product/sit-n-lock-non-marking-polyurethane-casters/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.championseating.com/product/sit-n-lock-non-marking-polyurethane-casters/?add-to-cart=5334>