Gator G-CASTERBOARD Rotationally Molded Caster Kit (Black) - Set of FourThe black Rotationally Molded Caster Kit from Gator is an excellent accessory for wheeling your G PRO or GR series rack. With two locking and two non locking casters, this rolling kit is perfect for getting heavy cases to and from parking lots or up and down ramps. The polyethylene material is inserted into a mold, and then gradually rotated until the material sticks to the edges of the mold in an even pattern. Once cooled, this plastic material forms