Black Leaf Glass Tips w. Strass for 8mm FiltersBeautiful reusable glass mouthpieces from Black Leaf . Simply roll the joint with an 7 til 9mm diameter activated carbon filter or a paper tip and then put the joint into the mouthpiece. The sparkling rhinestones add a touch of extravagance while smoking, but also provide due to unevenly smoke paths a little bit cooling of the smoke which is already cleared by the inserted filter. The mouthpiece filters are easy to clean with isopropanol alcohol and