In these days of a weak yen, we are seeing more and more overseas customers. The following is a rough estimate of shipping costs for a typical customer. For example, shipping six pieces of artwork, weighing approximately 1.6 kg after packaging, to Hong Kong would cost 4,200 yen. For example, if a piece is about the size of the palm of your hand, it should weigh about 600 grams. The weight of packing materials is estimated at 300g.　Please use this as a reference.

https://www.post.japanpost.jp/int/charge/list/ems_all_en.html