Soccer Innovations Heading Trainer Soccer Ball. Popular for youth training; 10 oz. soccer balls are ideal for painless training to master proper technique in striking the soccer ball and heading the soccer ball. The Striker is nearly half the weight of an official weighted ball. This allows young players to learn to head a ball properly without the fear of getting a concussion or the neck being strained or even injured. Comes in offic ial sizes 4 and 5. Weight is 10 oz. Made with high quality materials including a high end textured outer casing.