Xiaomi Electric Scooter 4 Pro adopted the incredibly strong aerospace grade aluminum alloy material for the frame, making the scooter extremely durable and lightweight. It is 60 mm taller, 68mm longer, 54mm wider for the handlebar, and 19mm wider for the deck.Xiaomi Electric Scooter 4 Pro adopted the incredibly strong aerospace grade aluminum alloy material for the frame, making the scooter extremely durable and lightweight.