It has been awhile since I bought this stuff so, I may not have everything correct. Since I am farting around with 2 pair of front speakers right now, I made another set of bi-wires to match the ones I made 4-5 years ago.
The spades are Radio Shack 10-12awg spades. (Better hurry, they might not be around much longer) I believe the larger silicone covers, on the banana plugs, came with the spades. The banana plugs are “dual” bananas from PE that I just cut them out of the plastic casing. Had to drill them out a little to accommodate the dual-12awg cables. The smaller covers on the spades came from some PE “closeout” of cheap speaker pins. A couple of bucks, I think… They were bought somewhere down the line from PE. Bought the pins just for the covers. Sometimes you can get the pins/covers from PE with cheap speaker cable packages. They also have gold plate, dual nanners also. I bought a 500ft spool of Phoenix Gold 12awg, 5-6 years ago? for wiring the house. As you can see the jacket has not discolored much over the years or gone green or gooey. I got another spool from Cables Plus? maybe. Same results. So, got lucky and both ARE quality cables. All connections soldered with WBT 4% silver solder. If you do something like this slip the spade jackets over the cable first. Mineral spirits works good as a lube. NO oils or spit please. Put some latex gloves on when handling the bare wire. You have oils and salts on your fingertips. Keeps the copper from oxidating and corroding.
Shop around, think outside the box. It can save you some bucks.