Speedway Motors Copper Exhaust Gaskets are die cut and dead soft. Embossed port ridge for a perfect seal. Cure the "leaky header blues" with these copper exhaust gaskets. Constructed of the finest .041 copper material and will seal where most gaskets fail. These reusable copper header gaskets are perfect for any application where changing headers is commonplace. Dirt track racing is all about the setup - and sometimes swapping to a different style set of headers is the winning advantage for that night of racing! Stay ahead of the competition with quality, reusable Speedway Motors Copper Exhaust Gaskets. 1-3/8" x 1-3/8" Can be trimmed to as large as 1.5" x 1.5" Soft copper material, for a sure seal. Reusable.