You will receive 1 tube of 50 luminescent light necklaces. Your order will contain a mix of colors depending on availability. Once they start glowing, glow light necklaces will last you all night. They will glow super bright for 10 - 12 hours. Then, they will start to fade out but may continue to emit some light for up to 36 hours. These glow light necklaces are fresh from the factory. They come directly from the factory and were manufactured just a few weeks ago. We are constantly getting new shipments from the factory, so you know these are as fresh and new as they come. They have a shelf life of 2 years. Inside the glow light necklaces are two chemicals that emit light or glow when they are mixed together. Inside the glow light necklaces is a thin glass tube, when you bend it for the first time, you break the inner glass tube. This mixes the two chemicals together. Just shake it up and presto -- it starts glowing like magic! These grow light necklaces, glow-in- the-dark products are non-toxic. They are not radioactive and they are not flammable. The almost never break open, but if they do, the chemicals inside can be washed off skin and clothes with ordinary soap or detergent.