This is an easy to learn, quick, reliable, and repeatable way to get your wall studs perfectly plumb and flat before installing your wall panels. Originally developed to prep showers, they can also be used for shimming ceilings, as well as depth gauges for self leveling compounds on flooring. Each shim kit averages over 900 shims in 7 different thicknesses. They are color coded for easy identification. A measuring depth gauge comes with each kit to speed the process. You can buy them at our website BuiltWithFoam.com