ITEM NAME:4PCS DC Power Female to Female Jack Adapter Connector 2.1 x 5.5mm Z a.imagelink a:hover.imagelink {color:#174d96;.4 pieces 2.1 x 5.5mm Female to Female DC Power Jack Connector. Simply & Professional appearance for power cabling. Shell material: plastic. No More Cutting and soldering! Material:Zinc alloy.