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! Features set of four strings. String size: .050 / .070 / .090 / .110.