Bead embroidery - once you start - you get addicted. These are light-weight wooden hoops that you can use and re-use, or leave the work on the hoop for display and mounting. To use, separate the inner and outer hoop, place your base material over the inner hoop, and slide the outer hoop over the top to stretch and hold the fabric in place.
Pro-tip - a strip of thin something on the inner hoop can help reduce slippage. Screw tightening mechanism.
Also appropriate for the other kind of embroidery, you know with OUT beads. (Shudder.)
Dimension is across the center.
Made in China. By the each.