Whip Mix’s Ringless Casting Rings and Formers includes: 4 sizes of Rings and Formers. Features: • Tapered ring design for easy removal of mold • Clear plastic rings are economical, durable and reusable • Allows for maximum expansion of investment • Eliminates the need for ring liner • Clean burnout of all wax shapes • Sprues with reservoirs prevent porosity • Durable, reinforced, plastic former bases Whip Mix Crucible Formers are available in several diameters and large and small oval shapes made of durable plastic.