The 15-pk 1099-NEC ENVELOPES are specifically designed for 3UP tax forms, with a size of 8-7/8″ x 3-7/8″. These self-seal envelopes are made by Sustainable Forestry Initiative and come in a quantity of 15. Manufactured in the United States, they are white in color and feature a self-seal design for secure mailing of tax forms. Perfect for businesses and individuals needing to mail multiple 1099-NEC forms in a 3UP format.