This is key, as it's actual oak used for winemaking. I didn't know this was available -- it's a good thing to look for. However, depending on how it's packaged, I might treat with K-meta before use.
EDIT: on a related note, I find it's cheaper to purchase larger packages, e.g., 1 lb oak cubes vs 3 or 4 oz packages. After taking out as much as I need, I folder the bag over several times an secure with a metal office binder clip.
FYI, binder clips are great for securing all types of plastic bags, including chips, cereal, and frozen veggies. A box of clips is cheap and they last a LONG time -- some of mine are probably 30 years old. There's not a lot that can go wrong with them.