Tite-Fit round-wound 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.