Round wood canvas stretchers are a one piece circular construction, Art Boards make Round Canvas Stretchers and Oval Stretchers for the artist to stretch canvas on.
Round Canvas Artist Stretchers made by Art Boards™ Archival Art Supply for Artists to stretch canvas for tondo paintings.
Circular stretchers | The Artist Surfaces Company
Wholesale round canvas stretchers With Ideal Features For Painting- Alibaba.com
Large Round Canvas - Crones Custom Woodworking
Wholesale round canvas stretchers With Ideal Features For Painting- Alibaba.com