The best brand of glow necklaces on the market! You will receive 2 tubes of 25 tricolor glow light necklaces in Red, White & Blue. Once they start glowing, these necklaces will last you all night. They will glow super bright for 8-12 hours. Then, they will start to fade out but may continue to emit some light for up to 36 hours. These FlashingBlinkyLights brand glow light necklaces are fresh from the factory. We are constantly receiving new shipments, so you know these are as fresh and new as they come. 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! FlashingBlinkyLights Glow products are non-toxic. They are not radioactive and they are not flammable.