Anti-burst - made with thick and durable materials. Rated up to 2, 000 pounds. Slip resistant - commercial grade material provides an excellent slip resistant experience while caring for your safety. Easy to clean - our fitness ball is easy to clean with just a soft damp cloth. Most important, Our fitness ball is phthalates free and doesn't contain any heavy metal elements. Extras - a free foot-pump is included! Size options - 38-45cm (S), 48-55cm (M), 58-65cm (L), 68-75cm (XL), 78-85cm (XXL)