I mentor a high school robotics team. Every year they build a new robot that can weigh up to 150 pounds. We need a cart to transport the robot from the pits to the playing field and this one works really well. The cart is sturdy enough to transport the robot or bins of parts around. I like that the handle folds flat so that it doesn't take up much room in the trailer. The four casters have rubber tread on the wheels. They are not air-filled tires, so they won't go flat. The front two casters are fixed. The rear casters can swivel to make it easy to turn and they have brakes that can be engaged so the cart doesn't roll away. I'm sure there are many more uses for this cart, but it works perfect for what we needed.