Berger Snow Guards are manufactured in a crystal clear polycarbonate with U.V. stabilizers. There are two models of the Berger Clear Snow Guards: RTCLSR - Structural Ribs and RTCLSM - Surface Mount. The unique vent rib system allows for adhesive out gassing, which increases the shear and mechanical strength. Superior engineering, along with the structured ribs, prevent common blade breakage. The three to one base to blade ratio adds significantly to the shear and peel adhesion of the device to the surface. The Snow Guards are also well suited for mechanical attachments and can be attached to any panel having a flat surface of as little as 3-1/2" wide.