Wearresistant material: Features electroplated springs for longevity, built with a strength aluminum alloy. Suitable for multiple riding environments. fit: Designed for small motorcycles and dirt bikes, offering seamless integration as a replacement part for electric scooters requiring a 100 mm hole center distance setup. Smooth riding: Allows finetuning of ride quality through adjustable spring stiffness and controlled damping speeds, delivering effective shock absorption and dependable performance on challenging terrain. Waterproof shock absorber: Rear shock absorber with a waterproof design to ensure rustproof operation and maintain its strength build quality for dependable shock absorption throughout its lifespan. Use scenario 1: a worn rear shock on a small motorcycle or dirt bike to improve ride comfort and handling in everyday riding or light offroad conditions. Use scenario 2: Upgrade an electric scooter that requires a 100 mm hole center distance rear shock to enhance stability and ride quality on paved roads and rough surfaces. Use scenario 3: Install in offroad or wet environments where the waterproof design helps maintain consistent damping and performance despite exposure to rain, mud, or puddles.