Specifications include, but are not limited to: 3.1.1. Glass beads shall be in accordance with U.S. Department of Transportation, FAA Administration, Advisory Circular No. AC150/5370-10H, Dated December 21, 2018, reflective glass beads for airfield markings shall meet Federal Specifications TT-B-1325M, dated May 10, 2019.3.1.2. Reflective glass beads shall not cause any performance issues to prevent AUS’ equipment to not operate effectively.3.1.3. Type I Gradation A Coarse Low-Index glass beads for drop-on applications shall be intended for marking highways and all airfield markings.3.1.4. Type III High Index glass beads for drop-on applications shall be intended for applications where increased retro-reflectivity is needed.