This pack of Entradalopes 190 Bright from Moab comes with 100 sheets of pre-scored 7 x 10" paper which folds down to 5 x 7" for use in the included envelopes. The cards are made of 100% cotton fiber and feature a basis Weight of 190 gsm and a thickness of 15.5 mil. Also, they are double-sided and both acid free and water resistant. The bright white envelopes are made of alpha cellulose and have a basis Weight of 120 gsm. They feature an elongated flap for easy use. Additionally, the paper features a matte surface finish.