5volleyball is a good match for the training of the special ball.

الوصف

This product is beautiful, beautiful color, light weight, safe, non-toxic, no pungent taste
First ball charge into the appropriate pressure, find a flat piece of cement and other hard ground, and will hold the ball, the ball at the bottom of the 1.8m height, letting go of the free fall to the ground, watching the ball elasticity, good elastic ball between 1.2 ~ 1.4 m.
Check the appearance of leather should be no moir, facial cleft, cuts and other, visual striate is exquisite, the surface is smooth, soccer ball shell suture is neat and uniform, dew line cannot exceed 1.5mm, adhesive basketball ball stem must be straight, no glue phenomenon.
The air tightness testing, all kinds of balls to check on the air tightness, no leakage, slow leak ball phenomenon. Commonly used method is to fill the ball to a certain pressure with water droplets in the gas nozzle, such as small bubbles are described in the sphere leakage.