It's used mostly by Cosplayers for armor parts and wheapons. It comes in big sheets of 1000mm x 1450mm
and at least 3 thicknesses.
Availability outside of the USEdit
Apparently Wonderflex seems largely unavailable outside of US. There is a importer in UK, which sells it at almost double price (as of Spring 2009). However, for small orders an eighth of a sheet (363x500mm) comes in handy.