Futures contract

Hey guys. I am just wondering if there is a set in stone futures contract that everyone uses. Or if A futures contract is negotiable by two parties. I have looked over the web and cannot find an adequate response to my question. Lets say for example a currency futures contract. Where would I be able to look at the very technical wording of one????

Thanks

Try here:


http://www.cmegroup.com/trading/fx/
http://www.cmegroup.com/trading/fx/f...fications.html