This is a modern design dual coil humbucking pickup. Pickups like these are usually found on very high end basses. They use Alnico V magnets and the traditional bi-pole layout with two poles per string. It's almost like two Jazz Bass® stlye pickups in one cover.

These pickups are available only in black plastic covers with exposed pole pieces and will fit as replacements for Bartolini™ P2 (5 string) and BC (4 string) pickups. Dimensions are 4.25" by 1.25" and 3.95" by 1.25" respectively. Standard spacing is 19mm ctc at the bridge.