Therapist&rsquo;s Choice Inflated Air-Filled Stability Balance Disc-Blue Therapists Choice Pre-Inflated Air-Filled Stability / Balance Disc 13 1/2" diameter x 2 1/2" Height, Color=Light Blue (Aqua Blueish), Bulk packaged in plastic. Comes with Basic Manual, no display box, no dvd, no pump which isn't needed anyways 2 Sided Surface: one surface with rounded points providing tactile inputs for sensorimotor training; and the opposite surface with an anti-skid bars that resist slipping Balance disc promotes core stability, strengthens muscle tone, improves balance and body posture. Buy by the Case and Save Money! amazon link = https://www.amazon.com/dp/B07B139QXV