90% Full Circle Shaped Solar Screens using 5/16" x 3/4" Framing : Full Circle Shaped Solar Screens are measured with the width and height being the same. This solar screen is made out of the 90% fabric, we recommend the 90% fabric for all windows that get 4 hours or more of sun and the 80% fabric for all windows that get 4 hours or less of sun. This screen is made out of the 5/16" x 3/4" wide framing. We do not recommend building large full circle shaped solar screens out of this framing. This size of framing is good for smaller sized screens. If you are needing a larger sized full circle solar screen, say anything wider than 36", for strength we recommend using the 5/16"x1" framing instead of this 5/16" x 3/4" framing.