Pro-Art Strathmore Frame Artist Trading Card comes with Envelopes. Create swap and collect original artwork. These cards are a great way to meet other artist and share your work. It is perfect for art collage and mounting artwork. This package contains six 4-7/8 x 3-1/2 Inch blank white cards and six 5-1/8x3-5/8 inch white envelopes. It is acid free. Made in USA.