Flexible test cable. Voltage:1000V; Current:15A. Banana Plug: 4 mm. These banana plugs leads are stackable. You can plug more than one banana plug into the same banana socket. Kinda like "piggybacking" connections. The wire is decent thickness, the ends themselves feel rubberized and not hard slick plastic like some other types of cables you find. They are PVC test lead cables, very soft , very flexible, very nice to work with. Good test cables for your lab. Every electronic techie out there should have these cables. Sturdy Banana Plugs and the PVC insulation greatly enhance durability and flexibility of the leads that prevents the "memory" characteristic of plastic insulation after it has been rolled/wrapped for a period of time. Plugs fit well into other leads and tests sockets. These are good sturdy leads with thick wire. Good quality leads that work great for moderate to low current testing. These wire are good for up to 15 amps maximum. They are fine for basic electrical testing for things like automotive accessories, vintage cars, trucks and motorcycle, etc, as long as whatever you are testing uses a fuse of 15 amps or smaller. Wire-PVC Max voltage/current: 1000V 15A Cable Length: 100cm Cable Diameter: 4mm Cable specification: 1mm² Colour:Multicolor Material:Plastic Package Contents: 2 set x banana plug test leads