If you do an advanced search using "weighted gloves" in the "open discussion forum" as the "thread title," you'll find info on them.
As others have mentioned, Cathe and crew are wearing wraps (with extra black tape on to keep them from unravelling, which makes them look a bit like gloves).
If you want gloves, I definitely recommend waiting until you have your KB form down (especially not locking the elbows), don't go above 1#, and don't wear them for the warm-up or cool-down (and work up to using them gradually, starting with 10 minutes at a time).