The best Glow Stick Bracelets on the market! You will receive 4 tubes, each full of 25 Blue Glow Bracelets. (NO LEDs like in our other products.) Also contains 100 connectors so you can attach the ends together to make 8" bracelets, and even necklaces with multiple pieces. CRACK & SHAKE them up to activate! Once they start glowing, Blue Glow Bracelets last all night. Peak brightness usually lasts 5 to 8 hours; depends on how dark the environment you're using them in. They will fade eventually yet some colors emit some light for up to 36 hours. Can't use your Glow Bracelets all in one night? No problem, they have a shelf life of 2 years prior to activation. Inside the glow bracelets are two chemicals (non-toxic!) that emit light or glow when they are mixed together - this is why you must crack and shake to activate. When you bend it for the first time, you break an inner tube which mixes the two chemicals together. Just shake it up and presto -- it starts glowing like magic! FlashingBlinkyLights brand glow products are non-toxic and CPSIA Compliant. They are not radioactive and they are not flammable. PLEASE NOTE: Color may appear different before activation.