The Jazz III size is great for speed and articulation. However I find this red one too smooth, rounded, and thick. If you want a slippery buttery feel and a round tone, then these are what you want.  If you need maximum attack and definition, then I recommend the black Jazz III Tortex in .60 or .80m instead, which are the opposite of these red ones in tone. Application: if you're computer recording via DI and using amp sims for tight metal tones, you'll benefit greatly from the thinner tortex, especially on down tuned material.