Pickup, Gretsch Filtertron neck, chrome Filtertron pickup, neck position, chrome. Outer Dimensions: 2.80" x 1.33" (depth = 0.80") Mounting Centers: 2.50" Bottom Plate Dimensions: 3.11" x 1.26" FilterTron pickups are now made with alnico magnets as they were originally made in the 1950s and 60s.