Bouncy Bands are made from heavy-duty rubber and loops are molded on both ends so they install! The support pipes keep the Bouncy Band at the perfect height, while keeping it from sliding down the floor. The desk or chair can easily be moved around the room without the support pipes falling off. Note: The heavy-duty band and support pipes are latex free. Chair Bands are sized to fit chairs with a distance of 13-17" between legs. Desk Bands are 20" long and work best for individual desks that are 20-28" wide. The support pipes keep the Bouncy Band at the perfect height, while keeping it from sliding down the floor. Bouncy Bands are quiet and they don't distract others. Active students are more productive and spend more time on task when they can move. Students with short legs enjoy being able to rest their feet on the Bouncy Band instead of having them dangle all day. In addition, students who feel anxious when working enjoy being able to stretch their legs to release their anxiety while they work.