We bought the Hoppe's gun cleaning kit at a store and this pen light was included in the kit. Hoppe's makes great stuff to clean guns, but they were out to lunch when this light was added to their collection. The inside is a cardboard tube wrapped in foil paper. The light literally worked two times and then it quit. I can't figure out why it isn't working, but the craftsmanship is so bad, I don't know what made it work in the first place. Don't waste your money or your time with this one.