Why wouldn't they be baseball cards?
Other than the ones with postcard backs, they are....
Cards
That have baseball players on them
Issued in sets each year, even if there's a lot of similarity from one year to the next for many of them. Sort of like T206, and the Old Judges...
The size shouldn't be the problem, they're smaller than Turkey Reds.
And there are several other about postcard sized sets out there that are considered sets that are on thinner cardstock and also weren't issued in packs.
The not issued in packs shouldn't be a problem either, as most strip cards weren't and are considered to be baseball cards. (and pretty much all Topps sets from at least 57 until whenever they stopped doing vending boxes were sold both in packs and through vending machines)
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