Cinders are extrusive igneous rocks that can have a black, red, or brown color depending on their chemical makeup. The Cinders sold at MDI Rock have a combination of these hues and are often used as groundcover to help the drainage of homes. 

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Black Cinders
Black Cinders
Cinders - 3 to 8
Cinders - 3" to 8"
Screened Wine Cinders 1"
Screened Wine Cinders 3" - 8"