THATS CALLED NUT COAL, BIG SHIPS BURN BIG COAL. THATS THE SIZE YOU BURN IN A KITCHEN COAL STOVE. I BURN BIGGER COAL THEN THAT IN OUR PARLOR STOVE. OF COURSE THEY MIGHT HAVE HAD BIG LUMPS AND CRACKED THEM INTO 4 PIECES FOR PROFIT . THE BIG SHIPS AND FOUNDRYS BURN EGG COAL. COAL IS SOLD BY THE SIZE RICE,BUCK,PEA,NUT,STOVE, AND LAST BUT NOT LEAST EGG. I LIVE RIGHT IN THE HEART OF THE COAL REGION AND ALWAYS HAVE. IF I WASNT SO TIRED I WOULD GO TAKE PICTURES OF BUCK (I BURN THAT IN A STOKER) AND SOME STOVE COAL (I BURN IN THE PARLOR STOVE)