Bracketing Systems are a complete set of parts... basically the plastics, tracks, arms, thumb screws, locking pins, and screws to mount onto the specified CNC machine.
Assembly Instructions: https://support.pwncnc.com/kb/section/20/
Special Notes: Onefinity has released a new Carriage called the Z-20. This new carriage comes standard on their Elite machines while the older carriage they've called Z-16. Be sure to choose the correct option when purchasing bracketing as there are important differences between them.
Having trouble picking the correct option... Read through this page to help you choose: https://pwncnc.com/pages/picking-the-right-bracketing