sculpey eraser clay?

Was digging for some grant funding and came across this:
http://www.michaels.com/art/online/projectsheet?pid=e01648&categoryid=53
evidently, sculpey has a new line of clay that becomes an eraser when baked.
has anybody used this yet? I think it's fairly new... I can see elementary
kids LOVING this.
Donald Peters
Lubbock, TX
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