Interlocking design solves the problem of accidental separations of filled rings from their bases. Rings are tapered for easy removal of molds without the need of ring liners. The clear PVC allows view for correct placement and location of sprued wax-ups. Ring allows for a natural thermal expansion of investment for precise fit of casting. Pressing bases accept 2 Gm. ingots for smaller or single-unit presses. Height of ring is designed to fit any pressing oven without the need for a top. Investment smoothes and levels itself out naturally with no extra mess.