comprise anthracite fines (as to approximately 40 to 65% of the total weight), petroleum coke (as to approximately 20 to 40% of the total weight), bituminous coal (as to approximately 0 to 20% of the total weight), biomass (as to approximately 5 to 20% of the total weight), biomass char (as to approximately 0 to 10% of the total weight) and molasses and phosphoric acid as binder (as to a maximum of 20% of the total weight);

were manufactured from those constituents by a process involving roll-pressing and heat treatment at approximately 300°C;

are unmarked pillow shaped briquettes that are typically 72 millimetres in length, 58 millimetres in width and 42 millimetres in height or are unmarked hexagonal briquettes that are typically 70 millimetres in length, 73 millimetres in width and 39 millimetres in height;

have an average weight of 125 grams; and

have a sulphur content not exceeding 2% of the total weight.