The part consists of Al7075-T6 freewheel for Shimano MTB 12 speed. 
Supplied pre-assembled for a quick replacement complete with two bearings, a lip seal, four pawls, four springs and a 1.8 mm spacer for mount 11 speed cassette.
Compatible with all X-Hub SP and SL MTB & ROAD hubs.

Two versions check the tooth count on your ratchet ring if your unsure.

It is not compatible with X-Hubs made before 2012 (with 15 mm internal axle).
Made in Italy.