This is the 3mm / 2.85mm version of the E3D Hardened Steel Nozzle.  It is compatible with the Ultimaker 2 and 2 series  It is also compatible with the Ultimaker Original but will require a modification to the Fan shroud.

Looking for a nozzle solution that will let you print through large amounts of abrasive filaments such as carbon fiber, iron, glow in the dark, or glass filled materials without any wear?  

E3D has done some great studies to determine that printing with as low as even 250g of carbon fiber filled filament can damage the nozzle.  

They have developed this hardened steel nozzle as a solution.  

It is available in 0.25mm, 0.4mm, 0.5mm and 0.8mm sizes.  

The cross sectioned nozzle on the left is brass and has printed 250g of carbon fiber filled filament.  The cross sectioned nozzle on the right is hardened steel and has printed over 2500g (2.5kg) of carbon fiber filled filament with no significant wear.