Here’s some info and a cool little edit giving you everything you need to know about the new Mutant Owl Hubs.

“We designed and developed the Fe-Male system to maintain the look of a female hub with the possibility to use pegs without bending axles or breaking bolts.
With the Fe-Male axle, you can use 14mm pegs, but if you don’t use pegs, you just need to put the spacer washers.
To tighten the hub is very simple, just adjust the wheel by hand on both sides, make sure the axle is minimally centered and then give the final tightening with a tool in just one side, it will be properly tightened because the axle slides from one side to the other.
The advantages of the Fe-Male axle are:
Easy to tight
One single axle for a male or female hub
Stronger”

Mutantbikes Owl Hubs | Fe-Male and Sliding System from Mutant Bikes on Vimeo.