Strauss Hedgehog Balance Pods, Spiky Fitness Domes for Kids Adults Sports, Foot Massage, Stability Training, Physical Therapy, Yoga Gymnastics Exercise, Core Strength (Blue) Made of top material PVC - this heavy-duty balance pod has anti-slip rings bottom design to ensure safety. Gentle spikes stimulate blood flow and circulation;(Inflatable, Pump Not Included) BALANCE TRAINER - The pods can be used for a number of exercises that can help with balance, coordination, body toning and posture improvement; The balance pods feature tactile bumps, and can either be used with the dome side up, or down, for varied levels of difficulty; Arrange in any position and step from one side to another THERAPY DOME - Improve your dynamic balance, body awareness and coordination while stimulating the feet and circulation. Perfect to massage sore feet, reflexology, fallen arches, plantar fascitis, bunions, hammertoes, Achilles tendonitis, and other common foot problems ANYWHERE - Diameter: 16cm(6.3inch), weight 0.56 lbs, Light-weight and compact for anywhere and anytime practice