Hi All,
The HuTag case/outer layer coating is TPE. This plastic was selected as it's very comfortable against the skin and easy to work with thus balancing out cost. For long life:
1. When not in use store in the dark preferably in a sealed box
2. Clean with cool soapy water and dry directly with a cloth
3. Don't dry in the sun
As reported here HuTags will last a long time if cared for but they're not indestructible. Individually they are relatively cheap. Please feel free to contact me for replacement offers.