Photoluminescent is a big word that means a simple thing: Glow in the Dark! And do they ever! These Photoluminescent stickers can be cut to size or shape for indicators, decoration or emergency illumination. We were surprised at how brightly these panels glow after being 'charged up' with a bright light source. You can also pair them with UV LEDs for some epic blacklight action. One sheet per order. Dimensions: 3x5"