Indonesia has abundant natural resources like oil and natural gas, coal, tin, copper, gold, and nickel, while agriculture produces rice, palm oil, tea, coffee, cacao, medicinal plants, spices, and rubber. These commodities make up a large portion of the country's exports, with palm oil and coal briquettes as the leading export commodities. In addition to refined and crude petroleum as the primary imports, telephones, vehicle parts and wheat cover the majority of additional imports. China, the United States, Japan, Singapore, India, Malaysia, South Korea and Thailand are Indonesia's principal export markets and import partners.