Tilt cable plus the knobs/gear/cam for the classic Herman Miller Aeron chair ( not for the latest version *Remastered Aeron chairs) Makes any size Aeron chairs fully adjustable Forward tilt +knob Rear tilt lock+knob ** I will include tilt limit gear* and forward tilt Cam* for older Aeron chair ( *worth $40) *** with little handy is easy install this kit ,check it online or YouTube Video or email me for any questions .no installation or instructions with this sale