Develop muscle response and accuracy with the Molten Heavy Trainer Basketball. Made with a top-grade rubber construction, this ball features an official size, but heavier for effective training. Perfect for indoor or outdoor use. Molten At Molten USA, everything's done for the real game. Through the combination of innovative technology and superior craftsmanship, Molten USA creates products that enhance any sporting experience, maximizing the potential and performance of athletes around the world.