Most labels don't last so read the following carefully...
I am very particular about my labels - I like them as perfect and informative as possible. I use a free program called "My Label Designer" and print my labels just on paper and then laminate them with thick 250 + 250 plastic laminate. If not damaged they will last at least 7 or even 8 years. Ref: David Chulow - Venezuela
Aluminium tags and indent them using a stylus that you can buy at a craft shop. They have a rounded steel ball at each end - very easy to use.