We have been using Allflex tags and are losing to many of them. My only requirement on a tag is that it is extra large and has a pre printed number (ex. R100). We tag our calves at birth with the same number as the dam, and then at weaning they receive a tag that matches the tattoo. The tags that are on 4 and 5 year olds are almost faded so bad I can't read them. I need a tag surface that I can write a sire code above the pre printed number. What has a good retention rate, and a long lasting number burned into it?