They look like potato pearls without much luster. Why do you want to know? Did you buy them, want to buy them - or are you a seller?
I have bought ones like that at the local gem show- maybe $25 each- if you buy 10, except they are hardish to find with any 12mm. It looks like only a few strands have a center pearl that size. It reminds me of a lot I got from China once. I asked for 14 mm pearls and got a bunch of strands with one 12-13-or 14mm in the center of each strand. That was one hard lot to sell- I still give them away from time to time, many years later.