Pro X Fade uses 100% conductive plastic tracks and a wider stem for extended fader life.
Pro X Fade also allows the DJ to adjust both the feel of the fader and the cut-in point to suit their personal style.

part no.       description
004‐369JIT- XONE:DB4 XFADER PROXFADER  A&H PART OBSOLETE!
004‐378JIT - XONE:DB2 XFADER PROXFADER  A&H PART OBSOLETE!

Please note: 
Pro X Fade is now only available directly from http://proxfade.co.uk/shop/ 

Please discuss with Proxfade about compatible models and fitting.

 
Additional accessories can be purchased directly from the manufacturer's website:

Operating Manual
Cleaning Guide
Cleaning Tool
Torque adjustment tool
Caig Lubrication Oil [DEoxIT lube (D110L) Connector & Contact treatment]

If you need to order a spare Pro X Fader (Xone) knob, the part code is: AJ7734 (FADER KNOB PROXFADER). Speak to your approved Allen & Heath dealer or local distributor for availability and purchasing.

More information can be found on the Pro X Fade website.
including details on Cleaning and Adjustment Instructions, Lag Time Adjust, Cleaning and Lubrication, Torque Adjustment and Troubleshooting.