The Seymour Duncan SM-2b Custom is a high output mini-humbucker bridge pickup. Great for heavy blues, classic rock, hard rock and metal. The ceramic bar magnet and hot coil windings of the SM-2 give this pickup a more aggressive upper-mid detail than the SM-3, which makes it great for slide and higher output music styles. Comes with four-conductor hookup cable. Available for both neck and bridge positions. The bridge version is high output. The neck version is compensated for tonal balance. Often, an SM-2b Custom is used in the bridge with an SM-1n Vintage in the neck for versatility. For balanced and warm instruments. Works especially well with mahogany bodies and rosewood fingerboards. Players include Brad Whitford / Aerosmith, Robben Ford, Cesar Rosas / Los Lobos. SM-2b Specifications Pickup dimensions: 2.580" L x 1.085" W x 0.585" H Overall dimensions: 3.174" L x 1.085" W x 0.876" H (including mounting tabs) Mounting hole spacing: 2.924" Resistance: 16.41k Resonant Peak: 4 KHz Magnet: Ceramic Bar Connector: Four conductor.