Feature: 1. Ideal for Professional Training: These tennis balls are highly popular among teaching professionals and tutors for their durability. 2. High Altitude Performance: These balls are designed for high altitude play, offering excellent bounce and playability. 3. Versatile Use: Apart from training, these balls can also be used with ball machines or as massage balls. 4. Durable Material: Made of rubber and wool, these balls are designed to last. 5. Deep elastic seams can reduce cracking:Be used on any type of court (hard or soft), without any problems. Deep elastic seams minimize cracking, suitable for use on any type of court (hard or soft) without any issues. Specification: These training tennis balls, made of rubber and wool, are perfect for professional play and massage. They come in a variety of vibrant colors and offer excellent bounce and durability. Features: Ideal for Professional Training: These tennis balls are highly popular among teaching professionals and tutors for their durability. High Altitude Performance: These balls are designed for high altitude play, offering excellent bounce and playability. Versatile Use: Apart from training, these balls can also be used with ball machines or as massage balls. Durable Material: Made of rubber and wool, these balls are designed to last. Bounce Height: 120cm± Bounce height of 120cm± Deep elastic seams can reduce cracking:Be used on any type of court (hard or soft), without any problems. Deep elastic seams minimize cracking, suitable for use on any type of court (hard or soft) without any issues. Specifications: Material: Rubber + Wool Color: Yellow, Blue, Green, Pink, Red, Black Diameter: 6.5cm / 2.56in Weight: 60g / 2.12oz per ball, Bounce Height: 120cm / 47.24in Package Size: 20.2x14x7.2cm / 7.95x5.51x2.83in Package weight:410g / 14.46oz Package List: 1 x Box of High Altitude Durable Tennis Balls Package List: 1 x Box of High Altitude Durable Tennis Balls