The Skunk2 Alpha Valve Spring & Titanium Retainer Kit is designed specifically for Honda B16, B17, and B18 VTEC engines. This performance part is made of high-quality titanium material and comes with a 1-year manufacturer warranty. The kit includes both the valve spring retainer and valve spring, providing a reliable and durable solution for improving engine performance. The California Prop 65 Warning indicates potential health risks associated with the product.