I got these for my 4 year old daughter that loves mermaids. She fell head over heals for these. They are extremely bright when given sufficient time in lighted area. The glow dulls like any other glow in the dark item does but it is not super quick. We have all four hung up in her room and they glow for hours and light up the whole room. It's like having a night light but you don't have to waste money on electricity.I love to save money anywhere I can. I would definitely suggest these to anyone that has a kid obsessed with mermaids.