well, clay chips are made of actual clay, made with tons of pressure and cooked at about 300 degrees. I think clay composite chips are made of an artificial material to feel like clay, or have some clay in it, something close to one of those two. 11.5 gram clay composite chips should be fine, mike got some from www.5stardeal.com. Real cheap, and you can get as many or as little as you want. If you really want real clay chips, paul-son makes the chips for casinos, even the ones with the coin inserts like on the WSOP, you can find sets from paul-son on ebay.
that sig still makes me smile