What is the ABS seat ball? It is an air-filled and burst-proof therapy and training ball with an ABS Anti-Burst System, manufactured in Germany. The material Crylon is odorless and highly durable (up to 500 kg, with guaranteed burst safety for damage to the outer skin up to 120 kg). The product is latex-free and contains no banned plasticizers according to EU Directive 2005/84/EC. What does it do? It strengthens primarily the abdominal, back, and core muscles through safe, effective, and dynamic back and stability training. It can help prevent or alleviate back pain by promoting upright and active sitting.