Tite-Fit roundwound nickel-plated electric guitar strings from DR are designed to be great all-around strings. They are available in a wide range of gauges. Based upon a round core, the construction techniques for DR Tite-Fit electrics are venerable. However, the core wire and wrap wire in DR's are the latest, most advanced, and expensive metals available. For flexibility, for tone, for long life; for rock, blues, heavy metal, jazz. Tite-Fits are an incredible all-around string. Gauges 10-13-17-26-36-46.