PurAthletics Pro-Series 65cm Weighted-Shift Ball Kit with DVD. This unique weighted ball is a professional series ball with 3 lbs of sand ( lift it, shift it, impact shake,)0% faster aerobic and core work out. Ballast weight features Non rolling (stationary won't roll away) for active sitting. Tones abs, Thighs, & Gluts. Increases your Cardio workout & helps with weight loss. Gym Grade-Heavy Duty. Office, studio or home use. Large opening allows for additional sand for advanced users. Features Burst resistant technology up to 1,000lbs, firm feel for heavier users, and slip resistant texture. Hand Pump, DVD, Instructional Sheet, Extra Ball Plug, Plug Remover