Here's what Lollar say about the P90 Soap Bar '50s Wind Neck Pickup:
Based on pickups from Sean Costello's '53 Goldtop that he sent to Jason Lollar to copy, these soapbar P-90s are coupled with weak magnets to produce lower output, a delicate attack, and less midrange and bass. This produces a brighter overall tone with less grinding distortion. It's also slower to overdrive an amp as compared with stock P-90s. An excellent choice for players seeking an early Freddie King style tone. Includes de-gaussed Alnico 2 magnets.