At the heart of each drum is the legendary 6-ply Gretsch-formula maple/gum shell with its expertly formed 30-degree bearing edge, the exclusive "Silver Sealer” interior finish and rugged die cast hoops. The custom drum building team in Ridgeland, South Carolina uses time-tested, classic finishing techniques when applying the nitro-cellulose lacquers. . Gretsch takes pride in knowing that USA Custom owners can sit down every day and literally play the kit of their dreams.