it's a full 18 inches so it was good but it was also a little curved in the 6 foot length. A few days on the windowsill, but the shape is still distorted. Since I bought it for an 18" wide window seat cushion covered in light cotton I have to cut it. Doable but not what I wanted because now it won't make a clean cut. I think the problem came from the way it was rolled up.
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