We have always used the y-tex tags, but we seem to lose a lot of number tags throughout the year. I just purchased some of the Z-tags with tagger so I guess we will replace this year and see how they work. The only bad thing is there are no ear fly tags that use this tagger, so we will still have to use the y-tex for fly tags. Had problems in a few calves with infections this year from the 2 piece tags.