Aguilar DCB4MSET 4-string M-Style PickupAguilar DCB M4 pickups capture more harmonic content than traditional M type pickups due to their dual ceramic bar design. Aguilar designed this dual ceramic magnet pickup to give you huge, detailed tone, whether you put it in a passive or active bass with an onboard preamp such as Aguilars OBP 1, 2, or 3. Upgrade your 4 string bass guitar with the Aguilar DCB M4 pickup and experience enhanced dynamic response and richer harmonic overtones. World