Material: PVC Non-Toxic Material - Excersize Exercise Balls are made of soft, low-odor material that is free of common harmful toxic additives. Easily build core strength:Just sit on the exercise ball to build your core strength! Sitting on it activates your core, which stabilizes your entire body. Say goodbye to those crazy sweaty, smelly workout sessions and save your precious time Sitting on a ball for 15 minutes a day will give you great looking abs, a great looking body, and better flexibility. Multi-use: The stability ball works wonders for relieving your lower back pain by strengthening your core and back. Use it to also exercise every other part of your body, enjoy heavenly pre/post exercise stretches, and improve your posture with ease!