The Seymour Duncan SH-4 is easily one of the most popular replacement pickups in the world.
The SH4 offers the exact sound that many guitarists wish for, especially from the bridge position or in combination with a slightly more restrained neck pickup: high output with many overtones, melodious, and perfect in the middle frequency range - this pickup is justification for the popularity of Seymour Duncan. Make your guitar sing or roar - play as you wish!