Specifications include, but are not limited to: The beads shall be treated with a “dual coating” designed to provide moisture resistance and adherence promoting properties. The spheres provided under this contract shall conform to the AASHTO M247, Type I. Roundness testing will be done in accordance with ASTM D1155 procedure B. Not less than 80% of the total sample shall be clear and transparent and shall not be ovate in shape of fused spheroids. (Roundness will be tested by means of Wald Roundness Tester.) The surface of the spheres shall be smooth, lustrous, and free from film, scratches and pits. The spheres shall show high auto collimating efficiency. Not more than 1% shall be black, amber, or milky. The spheres shall be such shape and character as to permit their embedment in the freshly applied paint film so that their upper surface will be exposed to permit the refracting and reflecting of headlight rays.