A butterfly pouch is a special type of laminating pouch that allows you to make an edgeless ID Card when used with Teslin?? Paper. This pack contains 50 Credit Card (2.125" x 3.375") matte pouches, enough for 50 ID cards. Matte butterfly pouches are matte in appearance, light hitting them will not reflect nearly as much as a gloss pouch. Includes a 1/2" HiCo (black) magnetic stripe for storing additional information on your ID card. To read/write this stripe you will need a Magnetic Stripe Encoder, such as the MSE-750.