We've recently added the Filco Double Shot keysets to our store. These keys are made from double-shot ABS, so the legends will never wear away. They're a high profile keyset, with a rounded shape and higher weight. All of this produces a slightly different typing experience; you need to press down with less force to actuate thanks to the higher weight, and the sound is changed as well.
The full blog article describing the Double Shots (including how to install them) is here:
http://www.keyboardco.com/blog/index.php/2014/06/filco-double-shot-keycaps-installation-instructions-and-review/And here are some links directly to our store for the layouts we have available:
