This skateboard is a great fidget. It uses 6 mm outside diameter bearings for wheels.
The 4 bearings are from Amazon, 50 pieces, $11, PN 683-ZZ ball bearings.
The 2 axles are 3 mm brass round rods, lathe bar stock from Amazon, Favordrory, 20 pieces, $10.
A burr is left on the brass axel when it is cut to size with a cutter. This burr retains the bearing on the axel.
If you don’t want to buy the rod and bearings, I have extra and will send to first four that ask me for the axles and bearings with their USA address. No charge.
The author marked this model as their own original creation.