Reliable materials: The volleyball spike trainer is made of sponge, aluminum, polyester, iron and nylon, with fine workmanship, durability and safe use.Use function: When developing the form and hitting technology, the nailing train will firmly fix the ball in the appropriate position.Training tools: Using volleyball nail training equipment, you can easily improve your jumping, hitting speed and strength, arm swing technology.Widely used: Volleyball training accessories are very suitable for hitting, physical training and agility training.Perfect gift: Volleyball training tool is a gift for high school girls, boys and beginners, perfect for for training jumping ability.Specification:Material: Sponge + Aluminum + Polyester + Iron + Nylon.Size: Foam rod length: approx. 35 cm /13.77 inch.Note:There might be a bit color distortions due to different computer resolutions.There might be a slight errors due to different hand measurement.Package Includes:1 Piece Volleyball Spike Trainer.