Wood lace bobbins, the staple of the lace pillow.
Combos began as a way to use up short lengths of otherwise good wood or burls.
Rings, of course, have long been a woodturner's trick. They require a special tool and a good sense of touch, as you literally cannot see where the point of the tool is cutting under the ring. Push too fast and the ring will break. I like to mix and match multiple wood rings. Sometimes a fancy bead comes along that can be used as a loose ring, such as the cloisonne or rhinestone beads.
Standard Midlands styles average 4 1/8 inches in length and 1/4 inch diameter or thicker.
Woods may include African Blackwood, Ebony, Kingwood, Maple, Mesquite, Mopane, Morado and sometimes others. The key is that the wood must be medium to fine grained, or there will likely be pits that will catch threads. You can always email to see what is on hand.
These syles do not lend themselves to Bucks, or travel sized bobbins.
And yes, they are drilled for a spangling wire. The drill hole is not large enough to hide the knot; I do not encourage putting the knot in the bobbin because that will wear the bone as the spangle swings, and can cause the tail to break.