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X2I'd say cockerels, very red combs for 7 weeks old.
There's no real other signs to work with at this age yet but if they have single combs[one looks like it may have a rose comb, ah yes, I see in your older post, a Wyandotte or mix.] it should be pretty accurate to look at comb and wattle size and especially redness for sex.
Pea and Rose combs are trickier because they don't get as big, but a large amount of redness is usually telling.