These are some of the best test leads around.  They are Fluke's 4mm banana to 90 degree 4mm banana plug set.  They are just about 3' in length and are made of high quality silcone rubber.  This means they provide excellent saftey with a CAT IV rating but at the same time a pleasurable working experience since they don't hold shape following storage.  Undo the twist tie and they fall free and straight!  Beautiful!!!  This is important to me since getting your probes tangled around switch gear is a recipe for utter disaster!  With the opposite end being a straight 4mm banana plug, these can be adapted to a wide range of uses with 4mm plug style accessories.  Large clamps, speciality probes, or daisy chaining test leads (with a coupler)are just a few options.  They are pricey at around $25, but take care of them and they will last a lifetime!  I wouldn't trade these for anything!