Shimano compatible (slide on) Cog.
Non-ramped for singlespeed use and abuse.
Punched.
Steel.
3/32" for use with most any singlespeed chain - 3/32" or 1/8".
Silver.

Available in 14, 16, 18 and 20T sizes...you should probably buy one of each.
This is the same great cog as with the Misfit Psycles singlespeed hubs.

Designed for use on hubs with multi-speed or single speed Freehub Bodies.
This COG will NOT work with threaded hubs...but you knew that.

The inexpensive solution for you singlespeed and singlespeed conversion needs.

Please read the instructions PRIOR (as in before) installation.
INSTALLATION: Spring Loaded Tensioner
CONVERSION: Complete Instructions