Size:1# Material type:Aluminum Batteries included?:No Product Dimensions:5 x 5 x 3 cm; 20 Grams Size Name: 4# Promotions can vary depending on size name. About this item [Function]: Well protecting your bike from being damaged in case of falling down [Material]: Made of high quality aluminium alloy, good texture, smooth surface, practical durable for longer use [Easy to Install]: Comes with screw, the derailleur hanger is easy to install and remove [Fitment]: Fits to most types of bikes, can be replaced, reduce the maintenance cost of frame [100% Satisfaction]: If you have any question about this item, please feel free to contact us, we will help you within 24 hours on week days [Function]: Well protecting your bike from being damaged in case of falling down [Material]: Made of high quality aluminium alloy, good texture, smooth surface, practical durable for longer use [Easy to Install]: Comes with screw, the derailleur hanger is easy to install and remove [Fitment]: Fits to most types of bikes, can be replaced, reduce the maintenance cost of frame [100% Satisfaction]: If you have any question about this item, please feel free to contact us, we will help you within 24 hours on week days