This is a set of three B strings (new, opened, and unused) for long-scale bass guitars: two B strings from the D'Addario EXL series, EXL165-5, and one B string from the ECB series, ECB81-5SL. Product Details: EXL165-5 B String Gauge: .135 Type: Round Wound Material: Nickel Scale: Long Quantity: 2 strings ECB81-5SL B String Gauge: .132 Type: Flat Wound Material: Chrome Scale: Super Long These were left over after using the sets on a 4-string bass. They have been stored at home and are opened but new and unused. Shipping will be on days other than Tuesday and Thursday.