Gallery-wrapped canvas
Paintings on gallery-wrapped canvas have a clean edge. That lets you hang the art without needing an attached frame. The colored edges also look great when set into a floating frame.
Stapled on the back
The canvas is wrapped all the way to the back. All staples are hidden behind the painting, so you only see a clean surface along all edges.
Painted edges
The canvas edges are painted with a complementary solid color.