Do shield mastery feats work with orbs?

[SerPounce]

Do you get the PRR and double strike from shield mastery feats when holding an orb?

Also, are obs kosher with druid oath?

[HatsuharuZ]

I am fairly certain that druids can use orbs, since they are not metal. As for your first point, I have no idea.

[hucka]

they show the double strike bonus in the charwindow