An improved design on the common 3 rail marker. It blends the perfect match of stiffness to drive into hard soils and the flexibility of fiberglass to withstand repeated vehicle impacts. The back rib has been rounded so the stress from impacts is spread over a larger area. This design also provides a better surface to apply decals.
Unlike plastic markers that shatter or wilt in extreme temperature environments, the Tri-Flex shape is used to mark natural gas lines in the desert southwest as well as ice roads in the frozen tundra of Alaska. The fiberglass construction on all of the Glasforms flat markers can also survive ditch burns as well as forest fires.