This "skateboard" is obviously homemade. A good idea by someone. I acquired this item about 12 years ago. I have ridden it a few times I will be including those black wheels w/ it but, i do not have any extra bearings for the wheels. The bar stool has scratches on it from normal use by whomever made it. The black wheels are decent but, I am not sure how well they will roll as I haven't attempted to ride it in many years. This bar stool measures 14 inches in diameter.