From Futures Wiki

This ductile metal is famed for its thermal and electrical conductivity and graces all kinds of products in homes and commercial applications. Over thousands of years, copper and its alloys have been present in civilization and contributed to the history of humankind. In fact, when alloyed with tin to become bronze, copper gave rise to a new era in development. Contracts on copper and copper futures are traded around the world, but our specifications refer to the COMEX copper futures contract.

Contract Size: 25,000 pounds.

Price Quote & Tick Size: US cents per pound; minimum tick size is in multiples of five one-hundredths of one cent (0.05¢ or $0.0005) per pound, equivalent to $12.50 per contract. A fluctuation of one cent (1¢ or $0.01) is equivalent to $250 per contract.

Contract Months: All months.

Trading Specs: Open outcry trading is conducted from 8:10 AM until 1:00 PM ET. Electronic trading is conducted via the CME Globex® trading platform from 6:00 PM Sundays through 5:15 PM Fridays, Eastern Time, with a 45-minute break each day between 5:15 PM and 6:00 PM.

Daily Price Limit: Currently none, but you should always consult the exchange.