Stamina 65cm Crystal Edge Exercise Ball with Workout DVD Includes 65-centimeter Crystal Edge Exercise Ball, 30-minute workout DVD, foot pump, and workout wall chart 65-centimeter (25.5") diameter ball is appropriate for people up to 5'11" tall Use at home or at the gym to help improve balance, body alignment, and to strengthen stabilizing muscles Exercise ball is latex free and constructed of sturdy PVC 30-minute instructional DVD will teach you 32 exercises to use with your exercise ball