This sample was made with 5mm rings. The center unit looks the best.  You can see that I missed a couple of rings on the end units.

This sample was made with the 6mm rings, and I do like the way this one turned out better. I also tried 8mm, and it was too floppy.

Step 1. Add 8 closed rings to 1 open ring. Arrange as shown above.

Step 2. Pass 1 open ring through the top 2 rings and 1 open ring through the bottom 2 rings as shown.

Step 3. Now pass 1 open ring in front of the last 2 rings you added, through the 2 center rings. Add another ring in back, passing through the 2 center rings. Repeat steps 2 and 3 on the other side.

You should have 1 unit finished and it should look like the illustration above. Create another unit and connect, shown in the next step.

Step 5. To connect each unit, pass 1 open ring through the bottom center, the top, and top center rings. Pass 1 open ring through the bottom center, the bottom, and top center rings. That's all there is to this one. Pretty simple!!!