These Super Duty Fire Bricks are rated for superior strength in applications of over 3000ºF (1650ºC). They exhibit low shrinkage, excellent thermal shock resistance, and good resistance to alkali and carbon monoxide disintegration. These split bricks are 9″ x 4.5″ x 1.25″ and weigh approximately 4 lbs each. We also have them available in a full 2.5″ thickness (9″ x 4.5″ x 2.5″) and they weigh approximately 8 lbs ea. These can be very expensive to ship… Please give us a call if you’d like a shipping quote.