REEHUT Anti-Burst Core Exercise Ball with Pump & Ebook for Yoga, Balance, Workout, Fitness- 55cm 65cm 75cm 3 sizes available: 55cm (fit for 48to 53), 65cm (fit for 54 to 510), 75cm (fit for 511to 64). Ideal for strengthen the core muscles, improve balance, lose weight, tighten, tone, etc. Great for gym, home, travel and office use. Durable, anti-burst PVC material with anti-slip matte surface for a secure grip, rate up to 2200 lbs, thick, eco-friendly and smell-free. Air pump included, inflate easily and portable. 6 PAGE GUIDE BOOK to show you how to use exercise ball correctly and effectively.