These handy extension wires come in 3 and 6 feet lengths.  They are heavy duty, completely stackable at each end and  made with heavy strand copper wire coated with soft insulation, which makes them very pliable.  Each package contains 2 wires, one red and one black.   A reasonably priced and nice addition for your e-stim accessories.

Don't forget to designate the length you want in the Drop-Down box below.  3 feet is the default

To stack or connect other banana pin leads or wires all you have to do is simply plug directly into the connection as shown below: