The trusted brand "Gimnik" soft gimnik, a maximum diameter of 9.1 inches (23 cm). Comes with an original booklet that includes indoor exercises exclusively for muscular workers. Soft ball that can be used for various exercises such as Pilates and Yoga. No uneven surface There is no unevenness, but it feels tight in your hand. There is also a uneven type (uneven), so please choose according to your preference. When filled with air to the maximum size, it will inflate to a maximum diameter of 9.1 inches (23 cm). Features adjustable air volume to fit your workout. (Average Usage Size: Approx. 7.1 - 9.1 inches (18 - 23 cm)) If you inflate too much air, it will wear faster, so please use the appropriate size. Includes one inflatable straw There are 4 color variations red, blue, yellow and green. Q. The size of the ball you receive is smaller than the size of the ball (larger than 9.1 inches (23 cm)). A. This is not a ball with diameter size "9.1 inches (23 cm). In order to ensure that the ball is not larger than 9.1 inches (23 cm) when inflated it is noted that the maximum diameter is 9.1 inches (23 cm). The ball may be hard and difficult to inflate with the first time, but it will become more comfortable and become more inflated with use. Will not inflate to maximum diameter at one time. Slowly divide it into several times to adjust the air. There are also large balls available, but since they are spherical molded products manufactured by hand, there may be individual size variations. (For quality checks, all balls are inflated at least 9.1 inches (23 cm) at a time and inspected for inspection.) Because of the rubber material, there may be slight differences in size and size but this does not affect use. Q. How to inflate the ball successfully? A. Soft gimnik ball features you to adjust the amount of air you want anytime and anywhere. Therefore, there is no backflow prevention valve, so the air can be removed if you press the hole or plug the plug. Please inflate a little bit more and remove the straw (you have a finger to flatten the bottle) at the same time.