Precision-machined pushrods are made from super-strong 7075-T6 aluminum to shave grams and add style with their vivid red-anodized finish and laser-engraved logos. For maximum strength and durability, threaded steel inserts secure the rod ends with installed hollow balls. The rod ends are a direct fit when used with Slayer’s included P2 rockers. When using progressive-3 rocker arms, spacers 5133 or 5133A are required.