Materials and Craftsmanship: PVC is commonly used, offering wear resistance and durability, adaptable to various surfaces. Mostly machine-sewn seams ensure the ball's stability and durability. Some products utilize gluing for a smoother appearance. Ease of Mastery: The soft material and moderate weight allow students to better control the ball's flight direction and height when practicing basic movements like serving, blocking, and passing, helping them master the technique more quickly. For example, when practicing blocking, the ball will not be too painful, allowing students to practice more aggressively and improve their stability and accuracy.Moderate Flexibility: This allows students to experience the appropriate rebound during serving and spiking, helping them better master power generation techniques and rhythm. For use on the beach, the ball's relatively light weight minimizes sinking upon landing, allowing for better rolling and bouncing on the sand, providing a more enjoyable playing experience.