5-3/4 x 4-3/8" Size. Flap Opens at Top. Fits all 4-1/4 x 5-1/2" Cards. Over 35 Colors! Matte smooth finish is default, be we also have felt (has regular depressions similar to debossing), and shimmer finishes (also called metalic). At the end of the color palette we also have our luxury envelopes made from bamboo fiber (Bamboo White), cotton fiber (Cotton White and Soft White), and vellum (very smooth and translucent).