Hey parents, if your kid's ride-on car has stopped moving, this gear replacement set might be exactly what you need! This is specifically designed for those popular kids' electric cars that use the 390 gearbox system. The set includes all the gears you'll need - there's a large gear with 44 teeth, a middle gear that has 8 iron teeth in the center with 50 teeth on the outer ring, and a small gear with 8 plastic teeth in the middle and 67 teeth on the outer ring. Now, here's the important part - before you buy, you'll want to carefully check the gear teeth on your existing broken gears to make sure these match exactly. This set works with WW-3 and WW-4 motor gearboxes, and it's meant for the 3-gear gearbox systems. The plastic material is durable and made to withstand normal use, but you'll want to apply lubricant before installation to ensure smooth operation. Installation is pretty straightforward if you're comfortable with basic repairs - just make sure you have the right tools and take your time. These gears are essential for transferring power from the motor to the wheels, so when they wear out or break, the car just won't move. It's amazing how a few small plastic gears can bring a favorite toy back to life! Much cheaper than buying a whole new ride-on car, and your kids will be thrilled to have their wheels working again. Just double-check those tooth counts before ordering to make sure you're getting the right replacement parts!