Weird, Random Sanrio Cards from Temu? - Hello Kitty, Kuromi, My Melody, Pompompurin, Pochacco & More

I saw these random Sanrio cards, the company that created Hello Kitty and related characters, on Temu and figured it was interesting enough to buy. I don't know if these products are rip-offs of actual Japanese products, or if they are their own little creations but I decided to open them up to see what was inside.

[mia-vmx]

You dont really do much with them, people usually buy cards to collect them and get the rarest ones, and put them in a book of sorts. But otherwise theres nothing else you do with them

[stawbewwi]

Can someone please explain to me all the rarity meaning in sanrio? (R, sr, ssr, gr, qr, cr, ex, and so on?) Thank you🩷