18" Inflatable Exercise Ball & Nylon Sport Bag Combo - Great for Yoga, Pilates, Workouts, Fitness, Stability SLIP RESISTANT AND STURDY YOGA BALL - Made from high quality slip resistant material. Feels great on skin EASY TO CLEAN BALL - Low impact for joint safety, Designed for all skill levels Use the stability ball to Tone, sculpt and chisel your shoulders, arms, thighs hips, gluts, abs, and other muscles Nylon Sport Bag is great for Home or Gym - Measures 21"x10"x7" - Two zippered compartments with external mesh water bottle holder