1 Inch ball mounts o-ring size

Given that these oring are sold at outrageous prices, What's the size of these o-rings?

Thank you in advance

I bought 10 of nauticam for 10 dollars.

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Nevertheless I would like to know the size.

For 5 dollars I buy the complete kit for my CCR unit.

I have it in my list as 2-209. Check, but I think this is it: https://www.amazon.com/209-Buna-N-Ring-Durometer-Black/dp/B000FMYPM2/ref=pd_bxgy_328_2?_encoding=UTF8&pd_rd_i=B000FMYPM2&pd_rd_r=AF6Y16GZPJ9KX92YXT8A&pd_rd_w=5zfN4&pd_rd_wg=Ulpe2&psc=1&refRID=AF6Y16GZPJ9KX92YXT8A

10 bucks for 100.

Thanks!

From ULCS web page:

""BUNA O-Ring, Size 2-209." If you can not locate o-rings at a plumbing store then your local hardware store, Lowes, Home Depot, ACE, OSH sell them in one-packs from Danco # 95. (The size is 15/16 X 11/16 x 1/8)."

Perfect.

Already bought 50 pcs for 5