Elevate your workout experience with GAIAM Leg Extenders for Balance Ball Chair. These four black plastic and metal extenders are a perfect fit for GAIAM Balance Ball Chairs. Ideal for heights up to 6 feet one inch tall. They are suitable for gym & training, and target your legs muscle group. The leg extenders are a perfect addition for those who want to challenge themselves during their workout sessions. They are compatible with a balance ball chair and are easy to install. These leg extenders are perfect for those who want to take their fitness routine to the next level. 3.5