New Shockslot wheels

Hi friends, here is an image of a new type of wheels made here in Rome by Shockslot. The wheel is in three pieces ; as you can see, the tyre mounted, glued and sanded can be removed and changed in a few seconds without the need to remove the hub from the axle and remake the gear meshing.
At the right are the three pieces disassembled and the key used to fix the external ring. Ciao !