The patented Mag-Lok was designed to eliminate string lag during double-stop string bends and increase tuning stability - with a light perceptible detent for the return zero position. The revolutionary Mag-Lok design uses Rare Earth super magnets to securely hold the zero position during hard finger string bends, but transparently releases when using the whammy bar. It is truly the Holy Grail for ultimate control on all tone block style trem systems - including Floyd Rose. Installs in minutes with just a screw driver. Patent #10,026,383.