Small exercise ball, easy to inflate. With included needle air pump, stay inflated | Pilates ball small 6 inch, easy to grip. Fits for exercise like barre, fitness, workouts, anti burst | Pysical therapy ball, PT exercise.For between knees, lower back, hip physical therapy | Core ball for class & home exercise, quick to inflate. No need to mouth blowing, No need to frantically try getting a plug in the hole as it leaks air | Keep the ball away from wooden surface, when not use. Especially in hot summer. We kindly bring to your attention that this principle applies to most exercise balls