Please help sex these PBR

[Bigbody]

I'm new to raising chickens and got these from tractor supply, I've read on here where people can tell the sex of chicks, but I can figure my Barred Rocks out. I got 4 of them and I think all 4 are cockerels. Please help as I can't keep them if they are. I have different color leg bands on each, green, blue, purple and pink.

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[Bigbody]

They are 4weeks old

 

[Bigbody]

 

[Bigbody]

 

[Bigbody]

Sorry, I'm having trouble loading pics

 

[Bigbody]

 

[Bigbody]

 

[TLWR]

I think you may be right - the ones pictured look like they are boys. Their barring is much more white and those comes are looking rather large for 4 weeks.

 

[Bigbody]

 

[TheTwoRoos]

Are you sure their 4 weeks look a lil older.