How to choose a qualified volleyball

Since different volleyball are made of different materials, selection for volleyballs can be also different. So, how do you choose different types of volleyballs?

1. Leather volleyball. First fill the ball into the appropriate air pressure, then hold the ball in both hands. The two thumb points are about 3 centimeters apart, and then press the ball shell evenly to observe the pattern size of the ball.The appearance of sesame seeds is usually the first level ball;It is the second or third level ball that appears.There are four levels of walnut grain.

Appearance inspection requires the leather to be free of turtle, cleft, knife and so on. The skin should be fine, smooth and smooth, and the ball is straight and smooth.

2. Rubber balls. Uniform color, no stain, impurities, bubbles, leakage, etc.

3. The ball should focus on the airtight performance, and the ball requires no leakage, slow gas, etc.The commonly used inspection method is to inflate the sphere and then use the water droplet on the gas mouth. If there is a small bubble, the ball will leak.