The contract size for pigs is 40,000 pounds (~ 18 tons) and the tick size at $ 0.00025 per pound ($ 10.00 per contract). The contract months are February, April, May, June, July, August, October and December. The last trading day is the 10th business day of each delivery month at 12:00. The daily price limit is $ 0.03 per pound above or below the settlement price on the previous day (Does not apply to the last two trading days). The electronic trading hours begin Monday at 09:05 to Friday 13:55 by Central American time (Central Time). Between 16:00 and 17:00 is not traded. More information can be found here.
The CME (Chicago Mercantile Exchange) is an American financial and commodity futures exchange in Chicago. In 2007, CME and CBOT the (Chicago Board of Trade) was merged into common CME Group Inc.. At the CME both e-commerce and via "Open Outcry" is traded on the floor. You can find an overview of agricultural commodity futures here.