The Original Tenn-Tube is a patented tube, designed to help children pick up tennis balls scattered all over the court during practice. Pop the Tenn-Tube over a ball, press down slightly, and it magically stays up in the tube, which holds up to 21 balls. Patented top-band secures balls in the tube until you need them. Tenn-Tube can be hung on a fence, or stood in a corner, when not in use. Or you can set it out on the court for kids to aim at, when working on their shot accuracy. Made of durable, lightweight plastic.. Education Categories: Physical Education / Balls / Sports Balls . UNSPSC/NIGP Codes: 4916160400 - 80500000