Debbie, my granddaughter and I used the circular foot to quilt her quilt. If you go to my profile, it is the lime green and turquoise one. We did it as a ragtime quilt so she could sew the circles on each block as we went. The quilt has a flannel back, batting, the top square and then 2 circles and we had no problem sewing through all those layers. However, I'm not sure about concentric circles that are close together - I didn't try that.