An email came from Taiwan three months ago.
Subject is:Mast stock sales. SDM 490 100% carbon is US $ 110..etc.
Then mail come again last month.
OK I was asking JAPAN GPSTC team member.
Condtion: Soooo cheep.. No Warranty ,COD....
Then we ware trying to buy. I said It is Gambling or Joke.
SDM 430,460,490 RDM 370*3,400,460.

This Taiwanese company is a professional maker of the
carbon composite.

we tested it in Morito two weeks ago.
1)430 SDM 100% carbon. North sail 2cam 6.6
Start to pull down hole. Creak sound!! Stop to pull.
Hold it.It was broken suddenly from boom postion.
NOT SET out hole. Five minutes and no sailing.
2)490 SDM 100% carbon. Gasstra 8.5 3cam
Non is rigging. But he was not 100% pull down hole.
then Start sailin. Eiji comes back to the beach and.
@@He said Non's mast was broken. ShXXT. Eiji took SUP..
*it was south wind, it was safe condtion and not strong wind.
*swim 500m help SUP.

30minutes sailiing only.
3)460 SDM GPSTC Saka (This one is Ao ).
He said " I will test only south wind "

RDM 400 and 460 ware OK.
I report to Maker.
They said(R&D) :
*Our product is following windsurfing Industry standard.
*Constant bend cave, so must use such spec sail.
I would like to say "It is joke mast."