Our Third Brake Light is produced with the same plastic used by auto manufacturers for exterior trim parts. This filament, ASA, is designed for robustness in automotive use. The lights are the same SAE/E4 approved Hella 12-LED versions designed for use as replacement third high-center brake lights.  We provide 3M double-sided tape for adhesion to the top of the rear window, but the light could also be mounted at the bottom on the shelf.  (The light surrounds are 3D printed and therefore may have minor irregularities in the surface.  This in no way effects the performance or longevity of the products.)
 
NOTE:  DOWNLOAD INSTALLATION TIPS SHEET HERE