SmartPlug 30 AMP SmartPlug/Twist Type Cordset w/Carry Case - 50ft One Size. It is also the only shore power cord on the market which uses tinned copper wire throughout the entire length of the cable for the ultimate in corrosion resistance. Specifications for SmartPlug 30 Amp 50' Dual Configuration Cordset w/Soft Carry Case: Manufacturer: SmartPlug Length: 50 ft Color: Black Package Contents: SmartPlug 30 Amp 50' Dual Configuration Cordset w/Soft Carry Case SmartPlug C30503: 30 AMP SmartPlug/Twist Type Cordset w/Carry Case - 50ft One Size