Our oil paintings are done on a variety of different canvas formats.
Canvas sheet, box canvas and canvas board.

Canvas sheet can be fixed to the backing board of a picture frame and displayed quickly and easily.
Box canvas can be hung as-is or framed. Floater frames are ideal for this.
Canvas board however, is about 3 to 4 mm thick and can be slightly tricky to mount.
The following link shows an ideal way of sink mounting the board to give a professional finish.

How to Sink Mount a Canvas Board