A small ceramic grate that sits at the bottom of your pipe bowl, the tobacco is then placed on top before lighting. This raises the tobacco off the bottom of the pipe bowl, which prevents the last portion of tobacco becoming soggy with tars and juices, thus allowing you to smoke the bowl all the way to the bottom. Lasts through 5+ bowls, simply remove with the stoker on your pipe tool. Non toxic. 6 Grates per pack.