A turbine-styled hubcap for Lego Technic Racing Medium wheels (56x34mm).
This version does not have an axle for mounting, making it more versatile. It can be mounted to wheels that already have an axle running through the center.
This is the left-hand version. See the right-hand version to complete the set.
Update: I received this at my home. Its center hole fits over a Technic axle very well, but it's a little bit loose. Use a 1/2 bushing to hold it in place (that's what I designed the recess in the center for).