what is a 7mm glass bong?

a 7mm Glass bong is a special bong in diameter. Most bongs are about 5mm and somelucky person will be winning this 7mm glass water pipe. The 7mm Makes it so the glass is extra thick . Some pros and Cons are....

          PROS                                                                                                   

• THICK                                                                                            
• SAFE
• UNIQUE

           CONS

• HEAVIER