Genuine James gaskets, seals and O-rings for Big Twin transmissions are made to last. Made in the USa. The James Gaskets Rubber-Covered Metal RCM line of gaskets are made from a solid steel sheet coated on two sides with a high-temperature elastomer. Strategically placed elastomer beading helps insure a positive seal while our clear silicone conformal coating fills in minor imperfections in the flanges and provides for easy release upon removal. They have excellent torque retention properties and will not extrude under high torque load.