Build quality is fairly damn durable. That plus the brakes are why I gave it two stars. If not I'd have presented it 1. I’d give it zero if I could. To shield the moving parts of an electric motor, most notably the shaft and bearings. Waterproof shaft seals https://www.electricscooter.ltd/10000w-72v-electric-scooter-11inch-motor-adult-fat-tire-skateboard/