These 10 x 13 Catalog Envelopes with Self Seal Closure are perfect for mailing large items. Made of sturdy 28 lb Brown Kraft paper, these rectangular envelopes feature a self-seal closure for secure delivery. The white color adds a professional touch, while the branded product dimensions of 13.38 x 10.38 x 0.1 inches ensure a comfortable fit for your items. With 100 envelopes included in the pack, these are a reliable choice for any shipping needs.