Mikasa volley balls are high quality durable balls with great features: aerodynamic panel design, excellent flight conditions, soft microfibre synthetic surface material and slight recesses for a better grip. MV210 is the most durable volleyball in our line-up with a tough personality to match. FIVB Official Ball. Premium synthetic leather cover .Nylon wound center .Airlock butyl bladder. Size 4 Synthetic leather , nylon wound and butyl bladder