We use Stimsonite® Snowplowable Markers. They are designed to improve plowability and increase reflector protection. They provide safe delineation to drivers in the most adverse weather conditions. The RPM’s approved on the Md Quality Products List (QPL) are as follows: Stimsonite Model 96, 101LP and 101LPS. The reflectors approved on the QPL are Ennis Model 944, Ennis/Stimsonite Model C40 (v) & (d) and Ennis Model 944.