Eraser Rubber (blue)

Not much to explain about this one I think :) I am not sure if this kind of eraser rubber is natural or synthetic ... I just picked Plastic because even if natural rubber is used its most probably still mixed with other (synthetic) stuff ... anybody knows details? The red one (which is a bit smoother) can be found here: Red Rubber The white one is here: White Rubber Render examples (with the previous version of the material though): http://www.flickr.com/photos/63231715@N00/278963746/ http://www.flickr.com/photos/63231715@N00/279878690/ A real life eraser can be seen here: http://commons.wikimedia.org/wiki/Image:Pelikan_Radiergummi.jpg