The Seymour Duncan SMB-4A is a 1976-voiced humbucker for Ernie Ball Music Man® StingRay® bass. Great for blues, funk, classic rock, southern rock, jam, and hard rock. This is a direct replacement for 4-string Music Man® StingRay® basses from 1976 to present. Music Man used Alnico magnets on the original 1976 StingRay basses. These groundbreaking instruments are some of the most highly collectable basses of their era, and are known for producing some of the most popular bass tones for metal, rock, blues and funk. Installing a ceramic magnet in a conventional humbucker will tend to make it brighter and edgier with a punchy bass response and a higher resonant peak. However in the case of Seymour Duncan"s SMB-4A Music Man replacement pickup, the Alnico magnets, together with unique coil windings, have the effect of extending both ends of the frequency spectrum beyond that of their ceramic magnet counterparts. In other words, the SMB-4A Alnico version is both warmer on the bottom and more detailed on the top. Seymour Duncan uses .375" (3/8") diameter Alnico 5 rod pole pieces and a winding spec that"s designed to product the same resonance as the original 1976 StingRay. The SMB-4A is hand-built in the Seymour Duncan Basslines facility in Santa Barbara, California. Mounting hardware and detailed wiring diagram included. Comes with four-conductor hookup cable and Basslines logo cover. The SMB-4A is generally used together with the STC-3M3 Tone Circuit for optimal tonal control. Players include Darrell Harris / Gary Puckett, Dan Lutz / Andy Summers, Roger Camero / No Motiv.