These cage cards are covered with a 5ml laminating sheet to make it very sturdy and have longevity of life. These cards have a metal grommet inserted into the card which is meant to be attached to the cage with Zip Ties
You will have all the information needed for your covey at a glance.
The marker will not run or fade in an outdoor setting.
The marker is removable with isopropyl alcohol and the card is reusable.