Ruby Red 3/4 inch x 150 feet Metallic Mirror Tape.
DECORATIVE MIRROR-SURFACE METALLIC TAPES – These shiny decorative tapes have a bright, metallic, mirror-like finish.
They are adhesive with a peel-off backing and can be used on hoops, picture frames, mirror edges, craft items, posters, gifts, etc.
Silver is not as sharp as a glass mirror, but is pretty close with some distortion.
Mirror tape is 3 mils thick (0.003″) and is available in several different widths and lengths.