Visually aids a fast exit during power outages and emergency situations. Made of B-324 photoluminescent vinyl film, our "Glow-in-the-Dark" arrows, footprints and dots are compliant to 10+ hour glow life which meets or exceeds the following standards: ASTM E2072-00/E2073-02/E2030-02, ASTM E162/E648/E662, SMP 800C, IMO Resolution A. 752(18), ISO/CD 15370, PSPA Standard 002 Part 2 1993 Class A Rev. 2: 09/99. Arrow size is 3". Standard package: 100 arrows. Brady B-324 BradyGlo material is a glow-in-the-dark (photoluminescent) pressure sensitive polyester. In accordance with ASTM 2030-99: Recommended Uses of Photoluminescent Safety Markings. Relevant Standards: Meets or exceeds the following standards. ASTM E-2072-00 / ASTM E-2073-00, ASTM E-162, ASTM E-648, ASTM E-662, IMO Resolution A.752(18), ISO/CD 15370, Marine Safety Committee MSC.27(61), DIN 67 510 (Parts 1 - 4), and PSPA Standard 002 Part 2. Meets OSHA 1910.37, Lloyd's Register SAS F050294.p. Illuminescent Characteristics: Charge time of 5 minutes at 1000 Lux will charge the sign for +10 hours of glow time. Not recommended for outdoor application.