Training Stand Gear Sponge Ball Kit For RC Walkera Trex Align 400 450 Helicopter Training Stand Gear Sponge Ball Kit For Walkera Trex Align 400 450 Helicopter Features: This training kit is great for beginners or experts who are trying out new helicopters or new set-ups. It helps balances helicopter and it greatly prevents blades or other expensive parts from tilting and hitting the ground or any obstacles, thus saving costly damage. By using the training kit, beginner learn how to safely land RC helicopter with ease. Can be used for 400/450 Helicopter like walkera 36# 60# 68# Align 450SE Length: 33cm Ball diameter: 40mm Package size: 35 * 5 * 5cm / 13.5 * 2 * 2in Package weight: 76g / 2.7oz Package list: 1 * Training Stand Gear Sponge Ball Kit