Postcard

If you search the world postcard at google, Wikipedia will define it as follows:

"A postcard or post card is a rectangular piece of thick paper or thin cardboard intended for writing and mailing without an envelope. Other shapes then rectangular may also be used. There are novelty exceptions, such as wood postcards, made of thin wood, and copper postcards sold in the Copper Country of the U.S. state of Michigan, and coconut "postcards" from tropical islands.

In some places, it is possible to send them for a lower fee than for a letter. Stamp collectors distinguish between postcards (which require astamp) and postal cards (which have the postage pre-printed on them). While a postcard is usually printed by a private company, individual or organization, a postal card is issued by the relevant postal authority."

According to the Pos Malaysia, "Postcard is a reactangular card that is neither folded nor enveloped, used to send simple messages to the recipient. It requires stamps for mailing. It shall be used for non-commercial purposes only."

Specifications of Postcards
Size	: Minimum : 140mm (length) x 90mm (width) : Maximum : 148mm (length) x 105mm (width)
Weight	: Not exceeding 20g
Shape	: Rectangular

Some other information gather from the Pos Malaysia,

International Air Mail Postage (From Malaysia)

Any letter which does not include international small packet and does not exceed one (1) kilogramme transmitted to a foreign destination by air. This includes item such as letters, self-mailers, cards, bills, documents, prints, etc.

Zone	Countries	Estimated Delivery Time(Working Days) Effective 01 January 2014	Rate (RM)
			First 20 gm	Every additional 10 gm
1	ASEAN countries: Brunei Darussalam, Singapore, Cambodia, Indonesia, Laos, Myanmar, Philippines, Thailand and Vietnam	4 - 10	1.20	0.40
2	Asia Pacific countries	5 - 11	1.40	0.60
3	Other countries	6 - 11	2.00	0.80

Notes:

©      The estimated delivery time listed applies to major cities only. Delivery to areas outside of major cities may incur additional days.

©      Packets, envelopes with enclosures, documents, merchandises, etc are subjected to customs inspection and clearance. Items subjected to customs inspection and/or clearance may incur additional 48 -72 hours.

©      If Express Mail service is used, delivery time may be one (1) day earlier than air mail.

©      Items may be subjected to additional control and domestic rules of the destination country. Where such circumstances occur, the sender is advised to deal directly with the relevant authorities in the destination country.