"Classic Bass" CB series bass pickups feature an extended and more resonant frequency range. They have far more "air" and definition at the top without sacrificing lows and low mids. They are cast in epoxy to remove unwanted feedback and microphonics. CNC machined blades on all of the 4 string bass pickups listed below allow them to cover string widths from 50mm to 59mm on medium curvature fingerboards with excellent string balance.