These large balls are available in the same sizes as our Original Pezzi® Physioballs STANDARD and offer similar performances, but they are made of the exclusive flexton silpower® (patent) material developed by our company and if used in accordance with the requirements contained in the instructions and warnings manual, they slowly deflate in the event of accidental damage caused by small tears or punctures, thus providing a safety factor to the user. Furthermore, cuts (up to 5 mm.) or small holes , can be repaired with the specially designed "Fixa-Kit". The grey metallic colour; their soft, velvety surface makes them a pleasure to use.