Improve road and construction zone safety with the durable, long-lasting FB Series 1-Sides Barrier Markers. They are made with a high-impact polycarbonate body and feature high-intensity reflective sheeting. These markers are easily installed: 3.5" x 3.25" x 2" version- Apply 50 units/tube of Astro Optics adhesive cement3.5" x 4.25" x 2" version- Apply 35 units/tube of Astro Optics adhesive cement Contact manufacturer for proper installation instructions. Available as 1 or 2-sided versions, in amber or silver colors, and in two different heights: No. of Sides Height Color 1 3.5" x 3.25" x 2" Amber or Silver 2 3.5" x 3.25" x 2" Amber or Silver 1 3.5" x 4.25" x 2" Amber 2 3.5" x 4.25" x 2" Amber or Silver   Additional Product Specifications: Body material: Thickness: Reflector: High-impact polycarbonate  .090" (2.3mm) thick High intensity reflective sheeting