It's actually Sri Lankan Walla Patta wood of the standard grade used in the production of most available oils on the market. If you look closely, the degree of resination is less than in the type of kyen used for some organics like Jing Shen Lu.... Yet it is common practice to grind this wood, and upon putting it in the water, if any molecules should happen to go under, the distillation is proclaimed as containing 'sinking grade' wood....
It's the kind of thing that makes you wonder why an oil like Ceylon No 1 is still not sold out?