3M diamond grade Conspicuity markings Series 983 are highly retro reflective micro prismatic markings designed to enhance the visibility of the sides and rear of vehicles. The reflective marking consists of prismatic lenses that are formed in a transparent, synthetic resin, sealed and backed with a pressure sensitive adhesive and clear polymeric liner. Diamond grade Conspicuity markings are highly durable providing up to ten years of field performance. 3M's Series 983 markings have excellent angularity which provides enhanced visibility for drivers.