This listing is for one (1) pair (two pieces) of 18lb valve springs to fit a Non-HEMI to fit Honda Clone GX160 and GX200 along with Predator 196cc 212cc go kart racing motor engine. This is an OEM RACING valve spring Length and Rate Tolerance will vary from spring to spring as tested from the manufacturer. These are the best quality 18lb racing valve springs on the market. It is the installer, user, and buyers responsibility to check and ensure these are the proper springs for your application. note: the springs may have some paint stripes or marks from inventory counting but can be cleaned easily. If you do not know how these work or how they are installed, please consider this before purchasing this item. Installation instructions are not provided by the manufacturer. Installation should be completed by a qualified engine builder only. Must check for coil bind, not always a drop in installation. This is critical on the Predator engine. Seller and Manufacturer are not responsible for improper installation and use. This product is intended for professional racing only. This item is for off-road, closed course, sanctioned racing use only.