VERSATILE USE: Not only great for pilates, yoga, back and abdominal training and pregnancy gymnastics or the hundreds of low impact exercises, but also can be used as office ball chair to improve your posture & relieve back pain.Product parameters:Product name: yoga ball / fitness ball / balance ballYoga ball type: with massage penaltyColor classification: blue, pink, grayMaterial: PVCnote:1. For manual measurement, the size may be slightly different, please forgive me.2. Due to the difference in shooting light, there may be some chromatic aberration. Please refer to the actual product.3. The general delivery time is 15-25 days, please be patient.4. If you have any questions, you can contact me by e-mail, we will give you a satisfactory answer.