This 5-pound pre-cut rubber mold material is perfect for creating jewelry molds through the process of vulcanizing. The set includes The Castaldo No Shrink Pink {only 4 pieces have been used out of the box} and Liqua-Cast Jewelry Mold Rubber is a must-have for jewelry makers. This United States-made rubber mold material is perfect for those who want to create high-quality jewelry molds. Aluminum Mold frame 1 7/8"x 2 7/8"x 1". Reduc-it pours into a mold and shrinks as it dries. Will give you a smaller piece to case. Only works to solid items. Pendants designs, Not for rings. You get it all for one price.