US Stove Company FBP6E Firebricks are designed to withstand high temperatures and prolong the life of your wood or coal burning stove. Every wood burning stove with firebrick liners will need to have its bricks replaced on a regular basis to keep the stove performing at optimum efficiency. This 6-pack of 4-1/2 in. x 9 in. x 1-1/2 in. pumice bricks is the perfect package to keep your stove operating perfectly. They can be used in any brand of wood or coal stove that uses this standard sized brick. They are designed to fit most USSC wood stove models.