Superior readability: Z tags are easier to read than other tags - from front or back. The fool-proof one-piece design means the back of the tag will not snag, pull out, or break off. Z tags are easier to put in ? no more torn ears. The unique pivoting applicator pin makes loading easy and eliminates ripped ears. Z tags feature an exclusive self-piercing tip. Clean, precise incision helps prevent infection & disease transfer. Numbered tags are sold in packages of 25. Calf tags measure 2 3/8" wide by 3 1/4" tall and are available in 8 colors: white, pink, purple, green, blue, yellow, orange, and red.