ANTI-BURST & SLIP-RESISTANT: The exercise ball is made of thick and durable PVC material. The material is Eco-friendly, latex-free and non-toxic. Plus, anti-burst design is used in superior PVC material, which ensures the safety is put in the first priority. Besides, balance ball is adopted high quality material, which provides an slip-resistance while using the exercise ball. The texture of the balance ball feels fairly comfortable. Thus, the safety of exercise ball can be guaranteed.