It's an everlasting supply of shuriken, no charges or limited amount.
You're not given the shuriken but the Varaelian Orb of Moon and Stars,
which can be activated every 10 minutes and gives you 50 shuriken.
Totally worth questing. 

http://vg-en.curse-gaming.com/database/items/details/1328643/varaelian-orb-of-the-moon-and-stars/

It wasn't me who took the screenshot of that item, think the crafter did it and he's pretty low adventure level.

The guy that made them is a lvl 37 leather worker, not sure at what lvl they can be made.
Not sure about the materials he used either, think a rare T4 leather was involved.

Build 1778 March / 13 / 2007

Vanguard Build 1778 Patch Notes 3/13/2007

CRAFTING NOTES
- Of Striking crafted items have been changed. The previous bonus from striking was too powerful and so these items can no longer be made. Instead recipes will now produce striking items that are within the balance guidelines and add a striking proc as well.
This is NOT a retroactive change. Old striking items will remain the same

- All old of striking weapons have been changed to soulbound

2 Days ago, Rapido of my guild Dogma on Gelenia made these for me, they were a worldwide discovery.
Guess that makes them almost unique, since they can not be made with these stats anymore.
Just wanted to show these to the monk community (to make you all very jealous hehe )

I'm a very happy monk!



Grahl Stonefist, Dragon Style Monk
Dogma - Gelenia