Made of durable PU (polyurethane) material, suitable for both indoor and outdoor use. Perfect for training. 【Recommended for】 ・Those looking for a genuine practice ball for club activities or school sports. ・Parents looking for a high-quality ball for their children's volleyball practice. ・Those looking for a gift for volleyball enthusiasts. Size: Size 5 (Official size for general, high school, and junior high school boys) Material: PU (polyurethane) Use: Indoor/Outdoor Condition: New, unused Air: Shipped deflated (pump not included)