tenso.com offers the following shipping methods.

・EMS
・AIR (Airmail)
・SAL (Economy Airmail)
・Surface Mail (Sea Mail)
・DHL Express
・ECMS
・EMS + Taiwan FamilyMart Pickup Service (Taiwan Limited)
・tenso Air Delivery Taiwan

If the package is not allowed to ship with Japan Post (EMS/AIR/SAL/Surface Mail), tenso.com customer service will notify you of the alternative by email.

For more information, please check the link below.
About International Shipping
https://www.tenso.com/en/static/guide_deliver_index
Usage Fee
https://www.tenso.com/en/usage_fee