TITE-FIT round wound nickel-plated electric guitar strings are designed to be a great all-around string. They are available in a wide range of gauges. Based upon a round core, the construction techniques for the TITE-FIT electrics are very old. However, the core wire and wrap wire in DR's are the latest, most advanced and expensive metals available. For flexiblility, for tone, for long life; for rock, blues, heavy metal, jazz,. TITE-FITs are an incredible all-around string. Our most popular electric guitar set.