Andoer Spock S510 4pcs Mandolin String Stainless Steel Exquisite Stringed Musical Instrument 4 pieces in 1 package, made of high-quality stainless steel. Sound is clear and bright. Each string comes in an individual package and is placed together in a bag. Material: Stainless steel E string (1st): 0.010"(0.25mm); A string (2nd): 0.014"(0.36mm); D string (3rd): 0.024"(0.61mm); G string (4th): 0.034"(0.86mm)