you will need to choose four stretcher bars, preferably heavy duty. If the frame is smaller than 25 inches square, lightweight bars can be used; however, heavy-duty bars are preferable. Crossbraces are recommended for larger canvases. Also to ensure a good canvas frame, it is recommended to fit the stretcher together before purchacing. Look for a set that goes together without too much force, but not ones that are too loose once assembled. If they fit together too tightly, you risk breaking the corners. If they are too loose, keeping the frame "square" will be difficult while stretching.
Canvas or Linen:choose unsized (or unprimed) quality canvas or linen (note: always try to choose the best because usually the less expensive the material, the cheaper quality ). Allow for a minimum of a 2" wrap around. If you don't allow this minimum, it will be very difficult to stretch later.
Staple Gun or Hammer and Tacks although staples are easier to use, tacks add a nice aesthetic quality to the canvas itself. Choose the proper length for either staples or tacks; both should be no shorter than 3/8" to ensure a good hold and no longer than 1/2". Longer staples or takes would just mean more work of pounding them into the supports.
Canvas pliers: these are optional, and only recommended for those with weak hands or when doing a large canvas (note: although the pliers are somewhat difficult to use in the beginning, they allow for a much tighter stretch).
