Thera-Band Exercise Balls are top quality stability balls. These balls are great for balance, stability, core strengthening, and a total body workout. Each ball comes with 2 plugs and an inflation adapter along with a Thera-Band Exercise Ball Guide poster which details 24 exercises. Balls are available in 5 sizes, 45 cm (Yellow), 55 cm (Red), 65 cm (Green), 75 cm (Blue) and 85 cm (Silver). Exercise balls are also available for bulk packaging in 4 sizes, 45 cm (Yellow), 55 cm (Red), 65 cm (Green), and 75 cm (Blue).