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Check the listing for details. Sliding Rheostat, 0-5 Ohms - 3A. Condition: New. Listed at 12.95 USD. Our sliding rheostat features a coil of bare nickel and copper alloy wire wound uniformly around a porcelain cylinder. This Sliding Rheostat has nickel and copper alloy resistance wire and employs an oxide film insulating layer applied to the porcelain tube.