Classic Circles feature four sets of Circle Nestabilities, including 2 straight-edge shapes:
S4-114 Standard Circle, Large (7 dies)
S4-116 Standard Circle, Small (7 dies)
These two sets are also found in Nest-04.

And 2 embellished-edge shapes, large scallop:
S4-124 Classic Scalloped Circle, Large (6 dies)
S4-125 Classic Scalloped Circle, Small (6 dies)

Also look for the Pinking Circle and Petite Scalloped Circle seen below.