Which mask and bracer for shammy?

[DeathsSilkyMist]

Bone mask and Bracer of Scavenging if you must pick between these. The DEX will help with your weapon procs next level. 4 WIS is like 44 mana at level 60 if you are under 200 WIS. I assume you are under level 60, so you are getting less mana than that.

Regardless of which items you end up choosing, the impact will not be large.