I've begun using the Color, Numbered, Bandettes, because I have an older flock, and another coming of age. These bands are working out great. The large black number is printed on opposite sides of the band for quick I.D. . Color Coded for age groups. Numbered for I.D. Pullets banded on left leg, Cockerels on right leg. Mine free range so I like the lighter colors of Blue, Yellow, White, because they contrast, and the dark numbers are easily recognized. Most of the birds don't pay any attention to their bandettes. They are loose, but won't go over their big feet. One cockerel picks at his new band, pulls it up and down his leg.
If these Bandettes come off your flock, get a smaller sized band.
Some videos show the spiral band being opened completely before putting it on the leg. Not necessary. Just pull up the outside end, lay it on the leg , and spin the band on, insuring the inner end clicks onto the bare leg, so that the number will show on both sides of the band. That's it. Just don't put them on upside down, or you'll have to redo it over again.