The warning pyramids / folding sign made PVC Reflective Materialweatherability
The warning pyramids / folding sign are exposed outdoors changing weather conditions.
Therefore, the anodized aluminum frame and therefore resistant against rust.
The aluminum frames have a central column.
The terms of the warning pyramids made of durable PVC coated plastic fabric
is self-luminous in white, the triangle in red luminous color (fluorescent).
link:https://www.reflextape.com/reflective-warning-triangle/foldable-tripod-warning-sign.html