This Manley piston set is great for car enthusiasts and mechanics who want to boost the performance of their BMW N55/S55 engines. Whether you're into racing or just want a more powerful daily driver, these pistons are a perfect fit. They're made from 2618 alloy forgings and come with high - quality wrist pins. The unique machining process ensures they work well and last long. Although specific size and weight details aren't provided, you can trust their high - end quality and performance.