what it really amazing is getting a glass bong slide, so the only "impure" material is the cap, all the rest is glass. Tastes SO good, and the best thing is you can take the worlds biggest hits. these hits are so big, my little sister had to practice for like a week before she could handle a full bottle hit. It can really tear up your lungs, so be carefull, but man it is worth it. also, try pulling the slide out and hitting through the slide hole (instead of unscrewing the cap). the smaller diameter hole increased the velocity of the smoke, in effect cooling it (ie blowing on soup effect as opposed to blowing on hands to warm them. fast air is colder.) and making it easier to hit.