Strong Materials: The bottle cage is made of polycarbonate and glass fiber materials which are safe, reliable, solid, having good performance for long service life. Fine Workmanship: Manufactured unique double sided processing technology, part of the polished , part of the ground , so that the water cup holder beautiful and durable. Tools Included: Easy to install, come with wrench and screws, suitable for all bicycles with kettle holder screw holes in the market, suitable for daily use. Specially Designed Shape: The one piece molding process can reduce the damage and make the curve more , also has the ability to reduce wind resistance and makes riding easier. Wide Application: Universal design, compatible with a variety of cycling water bottles, drink bottles and most of the carbonated soft drink bottles and mineral water bottles.