Guardian Glass North America now offers Guardian Bird1st Etch glass. The products include Threat Factor scores, which indicate the percent of times in which birds will not avoid collision, to quantify collision-avoidance effectiveness. Bird1st Etch glass is available on Guardian UltraClear low-iron glass and standard clear. Sizing is 96 inches by 130 inches on 6-millimeter-thick float glass through the Guardian Select Fabricator network.