Material... Paper Type... Cards, Letters, Wrapping This is a set of 20 long envelopes for inserting bills, gift certificates, etc. without folding them. They have been decorated cutely with stickers and masking tape. Includes bag sealing stickers. Regarding shipping, we will use the most affordable method possible. Also, we are not responsible for any problems after shipping. This is a handmade item. We make them carefully, but as they are handmade by amateurs, there may be some distortions or misalignments. Please refrain from purchasing if you are looking for the perfection of a commercially available product. m(__)m