They are easy to assemble without tools. Just press it. They look pretty good despite not being the same color as the rims. Removing the center caps can be a problem if left unattended. I damaged the first one I was trying to remove and had to have it replaced. The outer surfaces of the center caps are made of thin metal and are easily bent and scratched. A good suction cup or a very small screwdriver is enough to gently pry it off. Otherwise a great set at a good price.