Custom Concrete Weight Molds Create your own durable weight plates with these 3D-modeled molds! Simply place a pipe in the center, connect the mold parts with tape, seal with silicone, and pour in fiber-reinforced concrete. Once cured, you’ll have sturdy, labeled plates. For extra protection, keep the molds on; removing them may cause chipping. Print new molds as needed and build your custom weight set affordably and easily!