These are a great addtion to your office or stationary set. They measure about 5 1/4″x 71/4″ and are made from recycled specialty paper.. A 5×7 photo fits perfectly in it as well as handmade greeting cards. This set contains 100 of each of the natural Kraft brown and the white colors. They can be used for invitations, announcements, special photos or everyday letter writing. The self adhesive flap is a nice block type that looks both elegant and casual. They come in its own box for easy keeping. I really like how they look and love the self adhesive of the flaps. The envelpes can even be stuffed in a larger envelope for graduation.