If you need an easy way to denote key changes or label objects, these little tags from Avery can surely help. Their metal rings protect the paper inside from interference, and the bright colors are easy to see.
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Avery 11-026 Avery 1.25 in Diameter Metal Rim Key Tag Sku: AVY-11026 Metal-rimmed key tags make it easy to juggle the many facets of your life. Each tag features a split ring to slide easily onto your key for quick, easy organization. Cardstock center is easy to label; centered in a metal rim to prevent wear and tear....
What can I use to write on the cardstock of these tags?
Any standard writing utensils should work just fine. Pens and markers are easier to see, and will show up better than pencil.