Use Natural Fitness Burst Resistant Exercise Balls for fitness, core stability, yoga, Pilates and balance exercises. Improves back and core strength while sitting at home or office Includes: Exercise Instruction Chart (1) Fast Pump (2) Inflation Plugs (1) Plug Remover 65cm- Medium (Olive); for users 5'8" - 6'1" Proprietary burst resistant (up to 300lbs) composite for safety; Designed to deflate slowly if punctured