Iron Grip led the way in urethane manufacturing technology to create the first fluid injection molding line for heavy parts such as dumbbells and Olympic plates. Over the years, they’ve perfected their proprietary urethane composition and manufacturing process to maximize durability and adhesion, and they continue to produce their urethane line in the United States to ensure strict quality control. They blend their proprietary urethane formula exclusively in their own factory, and rigorously test each batch for stability and consistency. Their many years of experience and technical expertise allow them to produce the strongest and most reliable urethane-encased strength products available.