Elastic Rubber 310 SeriesMedium heavy duty caster elatic rubber caster, steel housing with bright zinc plating, elastic rubber wheel tread mold on nylon center, come with double ball bearings, with running smoothly and protect the floor, super silent, medium duty plate caster are designed for hand trolley, tool car, medium heavy equipment, top plate fitting, double raceway, excellent for medium heavy duty platform trucks and factory use. . Wanda Casters since 1986 years, 30+ years' experience and monthly productivity over 50 containers