Lamp shades in mushroom pleat linen material will arrive with a matching trim at the top and bottom of the shade.
The inside of this shade is a white styrene (plastic) material.
Lamp shades with mushroom pleat will have vertical pleats from the top to the bottom of the shade.
Limitations: The nature of this material does not allow for the bottom dimension of the shade to exceed a value greater than 3 times the top dimension. For example, a lampshade measuring 7" at the top and 21" at the bottom would be allowed, but the same shade with a 22" bottom will not work. This is because the 22" bottom is more than 3 times the top measurement of 7".