As an automotive enthusiast, I was disappointed with the Lantee Blue Tire Valve Stem .As a result of my tests i determined that they were poorly constructed and failed to hold air pressure properly. While they may be affordable, the low price is not worth compromising the safety and performance of your vehicle. The only pro is that they come in a variety of colors. The cons are numerous and outweigh any perceived benefits. save yourself the hassle and invest in a better quality valve stem..