Amazon.com: Rubber Sheet, Buna-N Rubber, Width 12 in, Rubber Length 12 in, Rubber Thickness 1/8 in, 70A : Industrial & Scientific
Rubber-Cal Buna-N Sheet- 60A Durometer- Smooth Finish- Backing- 3/16 Thick x 12-in Width x 24-in Length- White in the Rubber Sheets & Rolls department at Lowes.com
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Rubber-Cal Buna-N Sheet- 0.125-in Thick x 36-in Width x 12-in Length- 60A Durometer- Black- ASTM D2000 BG in the Rubber Sheets & Rolls department at Lowes.com