comprise petroleum coke (as to approximately 56 to 57% of the total weight), anthracite (as to approximately 37 to 38% of the total weight), and a dry powder binder (as to the remaining weight);

were manufactured from those constituents by a cold cure process using roller press;

are unmarked pillow shape briquettes 70mm x 62mm x 42mm;

have an average weight of 110 g per briquette; and

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