Yes4All Holiday Sale Stability Disc for Fitness & Balance Exercise It's identical to any top brand balance / stability discs out there by design, weight, & material Textured surface as shown to massage foot surface and improve grip Free air pump included as a bonus gift only, seller does not take any responsibility if the air pump is missed, lost or broken Size: choose between 13" or 14" diameter; color: blue Pre-inflated to a level suitable for most uses: standing, kneeling and sitting & push up to develop balance & stabilization