I have a friend who has a rod making/fly tying business and he got into the product end of things and he is going to limit it to rods and flies.
But here is a product description and they sell for $4 for 5 leaders...they were $12 or $13...they are heavier for bass or pike...made from nylon...they say saltwater on them but just because they are heavier test...here is the description
Taper Clip - 5 knotless tapered leaders in a package for $4
They are eiter 9 foot 12 pound test or 9 foot and 17 pound test...
Here is a picture