The Vinex AERO Training Javelin is made of the best quality hardened and tempered aluminium. Designed and crafted for maximum throw distance, this Javelin is made for extra durability. These javelins have the Real Cord Grip. These javelins meet NCAA and IAAF specs. Now you can train better with this javelin. It is great for building form, speed and skill improvement. It is one of the best available training Javelins out there.