Alliance Express's rigid casters are typically used in combination with swivel casters since rigids only allow the caster to roll in a straight line. These come in 5 materials nylon, polyurethane, black rubber, elastic rubber, and plastic. The rigid casters have a load capacity range from 88 lbs. to 1102 lbs. and wheel diameters which range from 3 to 6 inches. Please visit http://www.alliance-express.com/ to know more about their products
