Photo Mount Cards Weight: 80 lb. cover 5″x6.875″ size cards White-50 cards per box. Mount your photos, artwork or pictures to the front of these beautifully embossed cards. Included in each package are double-stick tabs for adhering up to a 4 Inch x 6 Inch picture. Matching envelopes are 5.25 Inch x 7.25 Inch.