4mm banana plugs are made of pure copper material which can withstand up to 32A current. The shell is made of insulating soft PVC.The wire can be crimped with screws at the tail, and the wire diameter is 2.5-3.5mm. The welding connection effect is better.Suitable for engineers or DIY enthusiasts. 4mm banana plugs fit most meters. Perfect for doing testing in schools, homes, laboratories and factories.Current Voltage: 32A / 30VColor:Black+redMaterial:PVC+CopperSize:Total length: 61MMPackage Contents:5 x Black Stackable Banana Plugs5 x Red Stackable Banana Plugs.Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.