Hey there, if you're driving a Buick, Chevrolet, or GMC and it's time for a tune-up, these NGK Laser Iridium spark plugs are exactly what you need! You get a complete set of 8 plugs - perfect for most V8 engines or other configurations that require that many. These ITR4A15 plugs feature NGK's premium laser iridium technology, which means better ignition, improved fuel efficiency, and longer life compared to standard plugs. They're brand new, come in the proper packaging, and match a ton of interchange part numbers like 4713, 5599, 12568387, 41-993, and many others. Whether you're dealing with rough idling, misfires, poor acceleration, or just doing routine maintenance at the recommended interval, fresh spark plugs make a huge difference in how your engine runs. Installation is pretty straightforward if you're handy with tools, or any mechanic can pop them in quickly. Imagine your engine running smoother, starting easier, and maybe even saving a bit on gas! NGK is a trusted brand that professionals use, so you know you're getting quality. Don't put off that tune-up any longer - give your Buick, Chevy, or GMC the fresh plugs it deserves and feel the difference in your drive!