80% Full Circle Shaped Solar Screens using 5/16" x 1" Framing : Full Circle Shaped Solar Screens are measured with the width and height being the same. This solar screen is made out of the 80% fabric, we recommend the 80% fabric for all windows that get 4 hours or less of sun. We recommend the 90% fabric for windows that get 4 hours or more of sun, generally those windows that face the West. This screen is made out of the 5/16" x 1" wide framing. We do not recommend building small full circle shaped solar screens out of this framing. This size of framing is good for larger sized screens. If you are needing a smaller full circle solar screen, say anything smaller than 36", we recommend using the 5/16"x3/4" framing.