Pumice firebrick splits measure 4 1/2" x 9" x 1 1/4" ; the most common size for wood stoves.
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US Stove Firebrick Universal Fit (6-Pack) FBP6E - The Home Depot
US Stove Firebrick Universal Fit (6-Pack) FBP6E - The Home Depot
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US Stove Firebrick Universal Fit (6-Pack) FBP6E - The Home Depot