The Black Multiuse Soft Neoprene Foam Sheets with Plain Back are made with an closed-cell foam which stops water, air, and gases from passing through. The foam sheets will not expand if they come in contact with oil. Thickness: 1/4 Inch Thickness Tolerance: -0.025" to +0.025" Inch Hardness Rating: Soft Temperature Range: -70° to 200° F Cell Type: Closed For Use Outdoors: Yes Tensile Strength Rating: Good Oil-Resistance Rating: Good Color: Black Sheet Size: 12" x 24"