Pistons are the single-most important component to making power. I piston that does not seal, loses power. A piston that has a poor dome design will not have good combustion. A piston that rocks significantly will cause excessive friction, and lose ring deal. And, a heavy piston will damage the rod bearings, main bearings and wrist pins. There are even more considerations that must be taken into account when designing a high-performance piston. Therefore, G-Force has gone directly to the top of the ladder, hiring Cosworth - one of the top names in Formula-One engines - to design the pistons to G-Force specifications for the little Honda NC-30 & NC-35 engines. These pistons are extraordinarily light, yet stronger than the OEM piston. The have lasted for years (actually decades) of race use in our high-output engines and are the go-to name in pistons for the NCs. Get yours before they are gone forever. No more sets are planned at this time.