This volleyball practice trainer is built for regular use and demanding drills, delivering reliable longterm performance. materials: Made from aluminum alloy and PP material ( polypropylene ), it resists wear and maintains performance through repeated use. Lightweight and portable: Lightweight, compact design for easy transport and storage. Practice on the court, in the gym, or at home. Easy installation: Tool setup that you can complete in minutes, so you can start practicing sooner and stay focused on skill development. Adjustable height for versatile use: Heightadjustable to fit players of different ages and sizes, supporting spiking, serving, and drills while improving handeye coordination safely across various training scenarios. Practical use scenarios: solo practice on a driveway or court for control and timing; small group drills in the gym for serves and spikes; beginner or junior training with adjustable height to build confidence and consistency.