Rowmark LaserGlow engraving plastic sheets are engineered to exceed photoluminescent standards like New York Local Law 26 for exit markings and glow ratings (+10 hr rating). Use this engraving material for directional, life safety and marine sign applications. These sheets are1ply for substrate or applique letters Quick Specs: Rotary/Laser, In/Outdoor, UV Stable, 1/8" and 1/16" hhickness also available