These are an awesome product from Montana Fly Company. The Centipede Rubber Legs are really durable. The Minis are incredibly small, and you could effectively put them on flies as small as an 18 and they would still fit well. You get a ton of legs per pack as well.
Overall, this is a product many probably don't know about, but should.
They would fit in the mid-range for legs. They're not so stiff that they'll shoot off the sides and not budge like some legs, and they won't droop down like crazy as legs for jigs will.
If you're searching for a rubber leg in that mid-range stiffness look no further.