Product Description Ball Casters - Ball bearings and roller ball principle allows unrestricted movement in all directions. These products can be used as casters or in the inverted position as a ball transfer unit. All caster components are made from carbon steel. Balls and supporting seat are hardened for long life. Exposed parts are black oxided. Stainless steel, nylon components, stud modifications and felt seals are available as special order. Please call for price and delivery.