A set of four plastic sculpting tools is actually eight because they're double sided. I use these for modeling or sculpting glass paste/clay. They're lightweight and come with a case to keep tools organized.
See my tutorial, how to work with glass clay: http://steiderstudios.wordpress.com/2010/05/28/glass-clay-a-step-by-step-tutorial-using-steider-studios-glass-medium/
I also use these plastic modeling tools in my Play with Paste classes at the Glass Craft and Bead Expo in Las Vegas.