The Sure Shot 507 Backboard and Flex Ring is an ideal choice for children over 4 years old. This is a safe product which can be used at home or in primary schools. The Flex ring is designed to teach the player how to slam dunk and more importantyly cope with the slam dunk. Whith a complex manover like a slam dunk the stand and ring are put under an immense amount of strain which could damage the stand and ring if a system like the flex system was not in place.