3M Color Stable is available in 50%, 35%, 20%, and 5%. Color Stable is a nano-carbon polyester film. Since the nano-carbon is dispersed throughout the thickness of the film, it ensures years of performance with no chance of the film turning purple. It can Reject up to 57% of the total solar energy coming through your windows to keep you cool and protect you from UV rays. This film is Non-metallized that lets you stay connected with mobile devices, GPS or satellite radio reception without interference.