Fuel tank made out of glass

And it also looks really cool.

2 kinds of people...

Its probably bullet proof glass they are kinda picky about what fuel tanks can be made out of.

Bullet-proof glass is very thick and you can see the layers if looking at the side. Plexiglass is also very thick. It could be plastic, but it's (again) not thick enough to hold it's shape if plastic. I'm positive this is just glass, and therefore a molotov waiting to kill you. And people make all kinds of illegal mods to their bikes, so it wouldn't suprise me if this person was just driving around in his deathtrap.