If you have properly conditioned the clay (kneaded it, so it's soft & flexible) and cured it (baked it) according to the directions on the package, it should hold up pretty well, but you can ensure flexibility and strength by also buying some of the "Sculpey Elasticlay" and kneading a small amount into the clay you're making your piece from. Also, don't make an individual "snake" thinner than 1/8". Lastly, for all kinds of helpful hints, tips, & pointers, go to www.polymerclaycentral.com --they have forums and contests, and a wonderful community.
Need to make a couple of corrections on my comment above (darn autocorrect, anyway!).: www.polymerclayexpress.com. And www.dickblick.com. THESE are the correct URLs, not the ones below (above?)
Wolfe24d - To harden the clay you need to bake it in the oven. Once they are baked they are actually slightly bendy and flexible which makes them such a great material to work with, They will not crack once baked.
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I love this simple yet awesome designs! I have some glay which I have been dying to use so this would be a great project for me hahaha
You bake them for about 20 min at 275 degrees