Copper is a paragon material, it's the environment, reusable, pliable and can be reused for many years to come. Why mess with plastic plant tags that disintegrate year after year when you can buy copper once and have it for generations to come? If you don't like the natural patina that forms over time, you can use a wire brush or steel wool with soap and water to clean these and get the shine back!
Copper is also anti-microbial, so you won't be transferring bad bacteria if you decide to move these stakes around from planter to planter or garden to garden. It provides a piece of mind that regular steel or plastic garden tags simply don't! It can also provide copper as a micro-nutrient which all life needs to thrive!
If you are into Electroculture, these are perfect for you - When partially buried in soil, Copper Wire creates a conductive pathway (electricity) for natural electromagnetic energy. This energy interacts with plant root systems, stimulating root growth and nutrient absorption.