Ceramic apex seals for rotary engines. Mazda. Used in the fastest 13B in the world Sporty/Colon 6.97 @197 Mph (05 Dec 2007) Check out the thread on rx7 club for more details and results: http://www.rx7club.com/forum/showthread.php?t=182522 Wear issues or have problems with heat, ceramics may be for you. Prototyping available for any application you can dream up
