US Stove Single Firebrick for Stoves, 4-1/2 in. x 9 in. x 1-1/4 in., Tolerates Up to 2,000 Degrees Fahrenheit at Tractor Supply Co.
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Amazon.com: Protalwell Woodstove Firebricks, Upgrade Fire Bricks Replacement for US Stove FBP6, Size 9" x 4-1/2" x 1-1/4", 6-Pack : Home & Kitchen
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