These pickups are split coil hum-cancelling designs - think of them as a "P-Bass* pair in box". These are wound to yield more "growl" from the Bridge pickup. They are very similar to our old 94J pickups, just ever so slighlty brighter at the bridge. These have stronger lows and low mids than the typical "vintage" tone. Dimensions Neck Pickup Length = 3.60"(91mm) Width = 0.73"(19mm) Bridge PickupLength = 3.73"(95mm) Width = 0.73"(19mm) Please Note:Bartolini does not provide screws with their pickups.