Shimano SLX RD-M7100-SGS 1x12 Speed Mountain Bike Rear Derailleur

The derailleur is brand new, in the box and 100% authentic. See second and third photo: the pen mark next to the size specification is hand written. There are many counterfeit SLX derailleurs out there. The counterfeit boxes have a computer printed check mark rather than a handwritten mark. This is the real deal. It is easy to be fooled. Don't get inferior materials, design, durability and performance. 

SLX is an incredible value. It works as well as the higher end offerings by Shimano with a small weight penalty. This derailleur is great for cross-county, trail and enduro riding.

Specifications:

Long cage for 10-51 cassettes

Microspline freehub body compatible

Shadow+ RD design

Direct mount attachement

13 tooth pullies