Typical High Quality from Denso, but be cautious of application
Having been a service manager at a midwestern motorcycle dealership and a mechanic for 45 years, I have seen lots of brands come and go, rise to prominence and then the quality tapers off. Denso has always been good stuff. The quality of these plugs is unsurpassed, it really doesn't get much better than this. They come pre-gapped so you may have to change the gap for your application, AND be aware, and more importantly watch your application! If you use a plug that requires the little nut on the tip to be removed to fit in your spark plug cap/connector, you need to look for a different number plug. These have the little nut CRIMPED in place so they don't unscrew, and if you try to remove them you can damage the plug. In the past, most companies allowed the nut to be unscrewed for use either way, but some vintage units still use the no nuts configuration.... Watch out for this and you will not be disappointed!