The Align 162 Tooth Main Drive Gear is a replacement gear for the Align T-Rex 500 class radio-controlled helicopters. The main drive gear is a critical component that transmits power from the main motor to the main rotor head, allowing the helicopter to lift off the ground and fly. The 162 tooth count refers to the number of teeth on the gear, which is specific to the Align T-Rex 500 helicopter. This package includes two gears, providing a backup or the option to install a new gear without having to purchase another package. The Align 162 Tooth Main Drive Gear is made from durable materials and is designed to withstand the demands of high-performance RC helicopters.