Sort:  

yes they are sand cast, only way to get them thin enough :) the stamping is what takes a little work, did it to give them enough grip, the metal is too slippery lol

Thanks for the info. I have been looking into getting some deft clay and 2 piece molds.

Checkout pmcsupplies.com they have everything and are very helpful, before you buy double check sometimes but is cheaper on their eBay store.

Thanks that's the exact place i was looking just need a little advise.