Set of 5 Metal Scalloped Circle Nesting Dies.
Beautiful for producing card crafting toppers
Sizes approximately 
11.7, 9.8, 7.6, 4.5 & 3.6cm diameter approximately.
To separate, just twist apart.
You may need snips to cut the tiny joining  bits off.
Cut on first try with the CutnBoss machine.
Photo 3 shows a card made using this die.
Sold as seen in photos' 1 & 2 without cut out examples.