Speed-Pro delivers the power you need and the value and quality that you deserve. Whether you are running at the track, chasing trophies on the strip, or just cruising down the road, count on Speed-Pro to provide the best value in HP engine components Product Features:Weight matched to +/- 2 gramsTAC ring groove geometryPiston skirts protected by next-gen DUROSHIELD coatingSophisticated barrel profiles help optimize oil wedge between skirt and wallExclusive higher-strength FM-425 alloy with 16.5% silicon finely dispersed throughout the material