KING ATHLETIC Stability Balance Disc :: Wobble Cushion Core Trainer :: for Home or Office Desk Chair and Kids Classroom Sensory Wiggle Seat :: Instructional eBook Included One disc per order. Unlike cheaply made discs that are flimsy, hard to pump, and lose air quickly, the King Athletic stability balance disk is easy to fill and holds air longer than other discs, even with continual use and extreme pressure. Please use caution when inflating not to accidentally puncture through the opposite side damaging the disc. Made from premium materials, the disc is crafted from a high quality, non-toxic and BPA-free rubber composite. Our 13 inch/33 cm diameter disk boost chair comfort with added support and a dual massage surface featuring small bumps and soft spikes. Great for hyper children or for kids with ADHD and fidget issues as it helps to absorb their energy and therefore allows them to sit still for longer and stay concentrated better. Our disk works great as a wiggle or wobble seat and is an excellent alternative to a chair balance ball. Strengthen and tighten core and back muscles with stability exercises that target a number of muscle groups. eBook Included - Our mission is to promote fitness and healthy living thats why we prepared 2 free e-books to help you out with your workout. Are you worried about injuries? Bored with your usual exercise routine? Want to get maximum benefits fast without tons of time-consuming research? Good news! Youll receive 2 e-books ($36 value) that give you a number of proven techniques to take your workouts and nutrition to the next level. We believe in quality products and thats why you get a 200% money back guarantee. This is better than money back guarantee! If you are not completely satisfied with your product, we will SEND YOU A NEW ONE and give you a FULL REFUND. See product packaging for more details.