12" across the top x 18" across the bottom x 18" on the slant x 17 3/4" high overall. Spider fitting. 3" drop. From Springcrest Collection brand of shades. Creme polyester, nylon blend fabric; mushroom pleated drum shade. Polyester, nylon blend inner liner. The correct size harp and a finial are included free with this shade. Soft back mushroom pleat drum shade in creme. Spider fitting. Spider drops 3" on this shade. The correct size harp is included free with this shade.