They feature retroreflective tape covered with clear plastic, which protects it from oil and dirt. These markers have a minimum reflectance of 1800 candle power per footcandle per square foot at 1/10 observation and 0 entrance angle. There is a a solid rubber, factory applied adhesive on the marker base for bonding the reflector to the pavement. This adhesive is covered with a 1" wide release paper liner. The reflective tape used on this marker measures .25" wide by 4" long, and made from a metalized polycarbonate microprism retroreflective material. Excellent for chip seal, slurry seal, or temporary delineation.