... kit, glue, air pump CE/UL Certificate: CE Delivery time: usually 3-4 daysPayment terms: T/T, Paypal, ... inside the ball does not circulate. The oxygen is limited. When people do exercises, they consume oxygen more ... not stay in the ball for a long time. The best time the player can stay in the ball is ... When finding the damage ,you must mend it in time.3. When carrying the ball, you should avoid dragging ...