Features: Make of nylons and Fiberglass, strong and enduring. This saddles mount adapters is suitable for most bicycles seat. The adapters can easily adjusted to any angles, allowing for more convenient access to your water bottles. The unique design allows for the installation of two water bottles simultaneously, meeting the needs of long distances cycling. Easy to install: Use the included fix belt to secure the adapters to the saddles rail, then simply attach your bottle cages to brackets and place your water bottles into the cages. Specifications: Component: nylons and Fiberglass brackets Size: about 8.7x11.50cm/3.43x4.53inch Package Includes: 1set Bicycles Bottle Holder adapters note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.