The ptp coreball has been designed to help improve core strength, balance and coordination at the same time. The coreball also helps with working on your back muscle imbalances and in maintaining a healthy posture, completed with the ptp branding and a hand pump. Coreball improves core strength, balance and coordination alleviate back pain improve posture reduces muscle imbalances increases flexibility and balance ptp branding hand pump included 55 cm pearl violet recommended for individuals from 140 cm 4aposapos7 up to 165 cm tall 5aposapos4 65 cm azure blue recommended for individuals from 165 cm 5aposapos4 up to 185 cm 6aposapos1 75 cm steel grey recommended for individuals taller than 185 cm 6aposapos1