Features:

Dual Coil Passive Pickup for 4 String Electric Bass.
Internal Low Impedence, Ultra Low Noise Preamp.
Ceramic Loaded Dual Parallel Magnetic Coils.
Prewired Solid Shaft Volume/Tone Control Set.
This is an passive dual coil pickup for four string electric bass guitar.
We have succeeded in getting this extended range by utilizing an ultra low noise, low-impedance internal preamp, paired with ceramic loaded dual parallel coils that result in an extremely versatile unit that can be used for just about anything from the cleanest highs right down to the dirtiest growling lows. This model uses an extended housing that is 3.5 inches (89mm), perfect for four string spacings. 

Specifications:

Bobbin:plastic
Cover:plastic
Magnet:two ceramic bar
Bottom:epoxy
Cable:four conduct with shield
Resistance:12K
Size:89.5mm*38mm*22mm
Weight:155.4g
SKU:EBP-002

Package List:
1*4 strings electric bass guitar pickup
2*screws
2*springs