EPS300 is a D'Addario custom hybrid bass set optimized for PRS basses with the unique gauge combination of .043 and .063 for the high strings and a tapered .085 and .107 for the low strings. This set is optimal for players looking for the ideal combination of biting high end, punchy lows and super long life. Fits basses with a string scale length of up to 36 1/4 inches. ProSteels are D'Addario's brightest and most magnetic bass strings. Optimized for Paul Reed Smith Basses, these ProSteels, with custom gauges and tapered ball-ends, deliver harmonically rich, brilliant high-end coupled with deep, tight lows that work in tandem to create the coveted "Piano tone" steel players crave. Great for both articulate fingering and aggressive picking, ProSteels give you the extra edge and punch you need to cut through the mix. , A special combination of custom string gauges for an ideal blend of tone and feel with bigger bottom end, D'Addario's brightest and most magnetic bass strings offering harmonically rich, deep and penetrating tone, Fits long scale basses with a string scale length of up to 36 7/8 inches, Made in the U.S.A. for the highest quality and performance, String Gauges: Wound .043, .063, .085, .107