3M(TM) Diamond Grade(TM) Round Reflectors REFR-3 (988) Red, Debossed, 3 in diameter, 50 per package Feature highy retroreflective prismatic lenses in a durable transparent synthetic resin backed with an aggressive pressure sensitive adhesive and clear poly liner. Meets and exceeds DOT and SAE A requirements for reflectors. Features - low profile, are not easily knocked off, easy to apply, 7 year warranty.