Nope. I'm pretty sure you're right with that assumption. At least I've never found any with anything else to them. They are one of the few store bought baits I've always had consistent success with on multiple species. Bass, walleye, pike, freshwater drum, love them around here. They dig deep, have a great wobble and I''ve never had a fish throw one. I went to Rapala/Storms website and in the FAQ they state quite clearly they don't sell blanks so that option is off the table. I'll end up making up some similar styled blanks myself sometime this spring (need some new tools to do so). That is, after I get all my soft plastic poured. I'll just have to decide upon a suitable wood.