This listing is for a set of 100 white poly mailers envelopes with a size of 10×13 inches. These envelopes are perfect for packaging and shipping various items. The material handling aspect ensures that the envelopes are durable and can withstand heavy use. The envelopes are ideal for businesses and industrial purposes, as well as for personal use. The set includes 2.5 mil envelopes, making it a great value for the buyer.