Bartolini 4-Str Original J-Bass Set BK; Original J-Bass mixed pickup set for electric bass, 4-string version, rich, warm, hum-free vintage tone, popular Upgrade for J-Bass pickups, set consisting of 9J-L1 (bridge, long) and 9J-S1 (neck, short), split-coil, dual inline hum-killing, magnetic circuit: carbon steel, ceramic blade magnets (ferrite), opposite polarity for bass and treble coils for neck and bridge pickups, DC resistance bridge position 6.7 kOhm, DC resistance neck position 6.1 kOhm, resonant frequency bridge position 4.9 kHz, resonant frequency neck position 5.7 kHz, 48 - 64 mm / 1.89" - 2.52" sensing width, 2-conductor, shielded coaxial cable, core hot, passive, black cover, dimensions bridge position (L x W x H) 94.7 x 18.5 x 23.6 mm / 3.73" x 0.73" x 0.93" (height incl. cable), dimensions neck position (L x W x H) 91.4 x 18.5 x 23.9 mm / 3.6" x 0.73" x 0.94" (height incl. cable), screws and springs are not included, Due to the manufacturing process, the plastic housings of Bartolini pickups may show minor processing or handling marks. The cable ends of some pickups may also be pre-soldered. These characteristics do not constitute grounds for complaint or reason for return