9in MINI ANTI-BURST EXERCISE BALL: Increase core strength & stability of abs, back, gluts, arms & leg muscles. Pilates, physical therapy, home workouts, personal training & yoga. almost 10 1nch small. WHAT I INCLUDED FOR YOU? 1 Anti burst Ball, 1 easy inflation straw & a pin to seal the balloon. Link to a very popular online workout video printed on package label. WHAT SIZE IS IT? 9in Mini anti-burst exercise balls. almost 10 1nch Small. Small fun kids bouncing toy WHAT DO I USE IT FOR? Increase core strength & stability of abs, back, gluts, hips, arms & leg muscles. HOW DO I WORKOUT? You can do pilates, yoga, physical therapy home workouts & physical training. " I printed the link on the packaging to the video I like to use. What I like the most? The ball is small enough to isolate the support at all the areas mentioned and more. Even simple situps are easier since the ball grips well.