This is what i found out about shara smoke long term useage of there stems. this is older stem so new ones may be btter but im not going to find out. currently using a KMhere is my review of a black sahara stem that i have been using for a while. the video explains most of everything. i am not bad mouthing sahara smoke at all. just if you find an old style stem from them DON'T BUY IT. they may have improved there stems buy direct from them to ensure the newest product. keep smoking