Hello Thaiyong,
Thank you for contacting me and letting me know about the shipping. I wanted to encourage you to try to find a means of having your products here so you can ship to your customers in the US within just a few days. In truth, I accidentally ordered this item not knowing it would ship from outside the US. However, if you are going to sell to American customers through Amazon and Amazon Prime in particular, they will expect a shipping speed of 2-3 business days.
Having the ability to deliver in that amount of time will help you sales here in the US.
Feather blades are great blades, I will wait the arrival of the product and use them gladly.
Best of luck!
hood