just going by what i see, and you can see the us tubes downstems and diffy's are cheap quality you can see it with your eyes......get mr puffy in here and I'll tell him too........form the lack of quality and style you can see leads me to belive that mr puff is outsourcing the downstems and diffys while he concentrates on the tubes.......They are thick and well made tubes........and they or most any way have a giant us tubes logo..........I own a sheldon now Ive smoked out of a us tubes.......the hits are both good I would say the sheldon has less drag and a little smother........just my opnion not ment to diss anything or anyone
