North American Pellets. Never tried them before. Got 'em at HD since I was right next door. They were out of Firesides. Freakin dust plume when you pour them and unbelievably ashy. I get more ash in 24 hours w/these than I do in a week with almost anything else including box store Ultras. And clinkers the size of VW Bugs. Never again. I'll call the oil guy before I'd give these another shot.