comprise anthracite (as to approximately 60 to 95% of the total weight), petroleum coke (up to approximately 30% of the total weight), bituminous coal (up to approximately 15% of the total weight), and a molasses and phosphoric acid binder or an organic binder (as to the remaining weight);

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

are unmarked cushion-shaped briquettes;

have an average weight of 48g per briquette; and

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