Customs Forms Required, Valua Limit, Size Limits, General Conditions for Mailing

Customs Forms Required (123)
First-Class Mail International items and Priority Mail International flat-rate envelopes and small flat-rate boxes:
PS Form 2976 (see 123.61)
Priority Mail International parcels:
PS Form 2976-A inside 2976-E (envelope)

Value Limit (212.1)
The maximum value of a GXG shipment to this country is $2,499 or a lesser amount if limited by content or value.

Size Limits (211.22)
The surface area of the address side of the item to be mailed
must be large enough to completely contain the Global
Express Guaranteed Air Waybill/Shipping Invoice (shipping
label), postage, endorsement, and any applicable markings.
The shipping label is approximately 5.5 inches high and
9.5 inches long.
Maximum length: 46 inches
Maximum width: 35 inches
Maximum height: 46 inches
Maximum length and girth combined: 108 inches

General Conditions for Mailing
See Publication 141, Global Express Guaranteed Service Guide, for information about areas served in the destination country, allowable contents, packaging and labeling requirements, tracking and tracing, service standards, and other conditions for mailing.

http://pe.usps.gov/text/Imm/il_016.htm#ep1640129

Please refer to site for any details and to see charts.