This is a slip-on fan guard for the stock fan on the MP Select Mini. It installs very easily; you just slide it on without needing to unscrew anything. It will work on other 30mm fans with the exact same design but not all 30mm fans have the same design.
When installing, make sure to line up one of the short pegs with the wires coming out of the fan.
20% (but probably doesn't matter)