. Arrived early, made of very light plastic, very shiny and can see low light through parking lot at night. I wouldn't leave them in a car wash, or even washing my car by hand (using something like tire cleaner) could damage the shiny finish. They twist very easily, but be careful not to twist or overtighten them. I even gave 4 grand to a friend at work who had just bought a new car. she loves them too.