solid necklace, two colour necklace, three colour necklace. Features: 1) Size: 6mm x 580mm2) Glowing time: 8-12 hours3) Non-toxic, non-flammable, non-radioactive, waterproof, windproof4) No heat, flame and sparks, no battery required 5) Conform to EN71 and ASTM F963 standards6) Storage life: 2 - 3years7) OEM acceptable8) Color: multiple colors Green, Blue, Pink, Red , white, purple and yellow ...