Yes4All Stability Disc for Fitness & Balance Exercise [ Holiday sale ] 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 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