Made of sturdy fiberglass to withstand the elements. Flexible enough to bend and then return to its original position. It will not bend out of shape like metal reflectors, and does not have plastic reflectors that can shatter or break. The 4" length of 5/16" diameter fiberglass is covered with two 5" strips of highly reflective tape for 360 nighttime visibility. 1 end has a protective cap, while the other is ground to a point for easy installation. Red and blue reflective tape.