this Humbucker surround fills in the gap and creates a snug fit, When removing Jackson Brand blackout Humbucke to replace with for other brand more traditional sized Humbucke like Dimarzio, the Stock Surrounds leaves a big gap between the pickup and the surround, this will fill the gap, so you end up with a nicer look. its simple to print. This was designed for My Charvel Model6 so all holes line up, should work with many other flattop Charvels and Jackso Like the early soloists