Grote's RazorBack Mid-Position Flashing LED Marker Lights have encapsulant potting for total circuit board protection and are easily visible from the cab during operation. Fits current mounting flanges and grommets. Patent pending electronic design meets all FMVSS 108 marker requirements and also flashes in concert with the turn signal circuitry to act as a mid-position flasher. 50-state-legal flashing mid-position marker.