The HTPOW 20000mW Blue Laser Pointer is 100% copper material barrel body,gold-plated,with a delicate shape . 20000mw blue laser can launch a clearly visible beam light , brightest laser is strong enough to burn cigarette or match , blasting balloon , even igniting all combustible materials . Which is also a astronomy and military laser pointer pen ,is the preferred equipment for astronomy enthusiasts, outdoor enthusiasts . Laser pointer belonging fragile electronic products, the core element is a laser diode, poor heat dissipation, no impact, although brass let cooling performance a lot better, but it is still not suitable for long working hours, so ensuring to be cautious when you use it. http://www.everyonetobuy.com/best-20000mw-blue-laser-pointer-pen.html