Astro Optics (TM) produces the highest quality outdoor-graded reflectors on the market. Trusted by safety professionals and roadbuilders for years, the JD Series reflectors are available as single-sided for side mounting or double-sided for top mounting. These units can be ordered in amber or crystal. These reflectors are often mounted to barrier-walls to improve the visibility and directionality of traffic. For best performance, mount at a 5 degree angle. Benefits: New and improved- Housing has been reinforced for added strength Largest acrylic cube corner delineator on the market- 3" high and 5.25" wide Brighter- More than 2x brighter than state and federal requirements for prismatic reflectors Self-cleaning- sealed against dirt and moisture to maintain long-lasting brightness Easily installed- apply with recommended adhesive Additional Product Specifications: Size Effective Reflex Area Material Housing Reflector Colors 3" x 5.25" x 2.5" Approx. 9.5 square in Meeting federal requirements Acrylonitrile butadiene styrene (ABS) Methyl methacrylate (Acrylic) Amber, crystal, red, blue