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Coil Commander 15" DD elliptical for GPX Minelab Minelab coil Semi-elliptical Commander 15"x 12" DD (38x30 cm). GPX, SD and GP series compatible metal search coils (old models). This 15 "x 12" double D search plate has a greater depth of search and soil coverage, but is less sensitive to the tiny gold lenses than the 11 "DD plate.