BMW License Plate Frame and Valve Stem Cap set License Plate Frame is made from Stainless Steel BMW Valve Stem Caps are made from lightweight ABS This stylish and attractive BMW License Plate Frame and Valve Stem Cap set is the perfect addition to your BMW. The Slimline License Plate Frame is made from Stainless Steel, and features a striking inverse BMW wordmark. The BMW Valve Stem Caps are made from lightweight ABS, featuring high-detail graphics under a protective doming and an internal O-ring seal. These features will help ensure the proper functioning of your valve stems without interfering with TPMS signals