Extra Medium strings for electric bassguitar. Whether you live for a thundering thump, a rhythmic slap or an artfully woven line, Dean Markley Blue Steel bass strings will get you there. Cryogenically frozen with a blast of liquid nitrogen, Blue Steel strings deliver massive tone, resonance and longevity. These babies are built to last! Made from Nickel Plated Steel. Features set of four strings. String size: .050 / .070 / .090 / .110.