Ear tags?

I know that tattoos in the ear are the standard for making rabbits, but does anyone use ear tags like other livestock.

I my local feed store has pink and green 5/8 ear tags. I was thinking that the colors to separate male and female would help the kids to keep from mixing them up and the numbers would help when I log their weights in my book to see if I have any acceptional growers, and keep track of parentage, all my rabbits are pretty much white with black ears.