This is pretty much the standard gas tank for the APN 6, 6S and Alpino models. The good thing about it is that it never rusts and is pretty impact resistant since it gives way but returns to it's form.
It has one problem and that is the gas cap. If you overdo it and close it to tight the cap will skip over the thread and it won't close air tight anymore, so just be careful when you're closing it.
It won't rust, but be careful! 
