Students love being able to wiggle while they work! The Bouncybands are made with heavy-duty rubber (free of latex and phthalates).Bouncybands 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 will enjoy being able to rest their feet on the Bouncyband 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. Characteristics : Easy to install Won't fall off when moving the desk Dimensions: 20 to 28" wide Bouncy bands are suitable for desks with legs less than 3.5 cm in diameter.