The Bintiva balance pods come in pairs of 2 and are crafted from professional grade materials. Each pod measures 6.25 inches in diameter and are 3.5 inches high. The pods sizing is designed for use with adults and children of all ages and sizes. Therapists and trainers recommend the use of the balance pods, as well as use them within their own sessions. The balance pods work the abdominal and trunk muscles, as well, as, pelvic muscles to address core strength, toning, balance, posture and coordination. They can also be used to treat plantar fasciitis and fallen arches. Activities and exercises using these pods range in levels of difficulty. Depending on the individual using them and the purpose they are being used for, the balance pods can be used dome side up for an increased balance and strength challenge, or dome side down to provide increased stability. The textured points on the domed side provide added tactile stimulation.