Castaldo® has been a major part of jewelry casting since the late 1940’s. Based in Massachusetts, USA, Castaldo® natural rubber products, include White Label®, Gold Label® and No Shrink Pink® jewelry molding rubber in a variety of convenient sizes and forms, are made from the latex sap of rubber trees grown on plantations in the rain forests of South East Asia. Other Castaldo® rubber molding products, such as our Super High Strength™ and Econosil® silicone molding rubber and LiquaCast® liquid rubber, are based on man-made products produced by the chemical industry.