Leg bands

[Crazyfarmlady25]

I have 6 chicks but 2 are the same breed and almost same coloring (white with black spots). When they were days old they were easy to tell apart now that they are 2 weeks they have more spots and wanting to get a band to put on one so won't get them mixed up til they get all the spots they are getting. I tried a tiny zip tie but everyone else wanted to peck her leg so I removed it. I don't know what size I would need from Amazon or if I could go get the little colored rubber bands for little kids hair (picture below) that break very easily. I also have 2 bcm's (just under a year old) that I want to get a leg band for so can tell them apart but again don't know what size they would need.