Coil splitting refers to the ability to disable one coil in a humbucker-type pickup. This offers the player option of getting a single coil-type tone from a humbucker-loaded guitar. Many pickups have three- or four-conductor wiring that allows for one coil to be disabled by shorting one coil to either ground or hot. All production Seymour Duncan humbuckers can be purchased with four-conductor wiring either stock from the factory or as a Production Floor Custom order. The exceptions to this rule are the Vintage Rails (SVR-1) and Duckbuckers (SDBR-1), which are wired internally in parallel from the factory.