Reviews Seymour Duncan SH-4 JB Jeff Beck Humbucker (Zebra)With so many available recently, it is great to have a make you can trust. The Seymour Duncan SH-4 JB Jeff Beck Humbucker (Zebra) is certainly that and will be a excellent purchase. For this great price, the Seymour Duncan SH-4 JB Jeff Beck Humbucker (Zebra) comes highly recommended and is always a popular choice with most people.