NBR BUNA RUBBER 3/8 THK X 5-1/4"OD ( IDEAL TO CUT YOUR OWN GASKETS) NBR BUNA-N HAS VERY GOOD RESISTANCE TO VEGETABLE ANDPETROLEUM-BASED OILS, SOLVENTS AND LUBRICANTS, USED FOR FUEL AND OIL HANDLINGSEALS, AS WELL AS OTHER APPLICATIONS WITH EXPOSURE TO CHEMICALS, Vibration dampener pads TEMPERATURE RATING: -20 DEGREES F,:225 DEGREES F, DUROMETER: 60A, ELONGATION: 250%, TENSILE STRENGTH: 1000PSI, We have other sizes available in stock and can cut any gasket with a detail drawing. FREE SHIPPING