YHL spend a lot of effort on design of winding machine to yield best HAND-WOUND tone, we carefully wind every turn of wire for controlling each frequency response in one pickup, for example, cut 800 Hz a little to get more clear and defined sound in high output pickup.​Marsbucker series is a Milestone in pickup area because of our FSSW METHOD, it owns unique touch feel like hand wound PU and precise frequnece response.