Description The item is a simple and practical RC helicopter training kit, which mainly includes training rods, sponge balls and center hubs, and is great for beginners or experts who are trying out new helicopters or new set-ups. It helps to balance helicopter and it greatly prevents blades or other expensive parts from tilting and hitting the gound or any obstacles, thus saving costly damage. By using the training kit, beginners learn how to safely land RC helicopter with ease. Features - Color: mainly blue.- Material: durable hard carbon fiber, plastic and sponge.- Training rod size: 330mm*3mm (Length * Diameter).- Spong ball diameter: about 40mm.- and Universal Anti-crash Landing Training Gear Kit for RC Helicopter.- solid blue lightweight sponge balls with strong carbon fiber training rods.- Great for beginners or experts who are trying out new RC helicopters or new set-ups.- It helps balance helicopters and helps prevent blades or other expensive parts from tilting and hitting the ground or any obstacles, thus saving costly damage.- Simple and practical design, easy to install and use.Package list: 4 * Carbon Fiber Training Rods 4 * Sponge Balls2 * Center Hubs16 * Washers6 * Ties