These pickups are all about huge, full, loud, aggressive single coil tone.  They use the same magnet layout as the Fat Stack, and the resultantly big coil is about as much single coil pickup that can be packaged in a soap-bar cover.  This is the ultimate pickup for the Jazz Bass®-on-steroids tone purist!  These pickups will fit as replacements for Bartolini™ BC shape pickups. Dimensions are 3.95″ by 1.25″.  Standard spacing is 19mm center-to-center at the bridge.