I make my own, I prefer 40lb flouro for main line. I will generally crimp a medium sized hook, preferably red, or a sing hook tear drop, leaving the look about 1/2" long. For the stinger hook, I like about a #8 red treble, for small/medium suckers or shiners; larger bait I'll use a #6 or #4. For the stingers, I use a light wire, right now I have 15lb test - I crimp the lead end of the stinger onto the loop that the main hook is on so it hangs no more than an inch below the main hook.
I hook my minnows in the back with the main hook so they hang naturally, then I hook the stinger straight below the main hook in their belly w/two of the hooks on the treble.
I have made the stingers with the same 40lb flouro, but there tends to be a bit more hardware around the minnow, especially because the flouro crimps are quite thick, even for the 40lb line. I tend to use these with the bigger hooks for larger minnows.
I've downsized a bit since some of the lakes I fish now have many mid to low 20" northerns and they get a lot of pressure. I did make a couple leaders with the 15lb wire as the main line, but after a fish or two they become too crimped.
