Colson Encore Dolly casters provide a quality, economical dolly solution. Zinc plating provides a durable and attractive finish to each caster. Double ball swivel raceways offer increased operation performance. Single insert-molded wheel bearings offer smooth rolling and are maintenance free for the life of the caster. Wheel tread material is non-marking and resists cutting or tearing. Encore products are backed by a 1-year warranty.