40-130 Medium Light Low B Bass String pack from Warwick. This Warwick Medium Light Low B Red String pack 40-130 is for 5-string basses. The set consists of .040″ .060″ .080″ .100″ .130″ sizes. These stainless steel roundwounds are computer designed long lasting great sounding and well priced. These Warwick bass strings boast carefully chosen materials. The adjustment of core and winding wire give an even tension well balanced overtone responses as well as an even magnetic response when being picked up.