Clasp envelopes are an excellent solution for accessible storage or filing. Whatever your home or office needs are, clasp envelopes can make staying organized easier! Great for projects, filing and mailing, Quality Park's heavy-duty double prong clasp and reinforced eyelets are durable for repeated use. Envelopes are made of 28-lb brown Kraft stock that is great for extensive handling, as well as mailing. Opening is on the long side for easier insertion and removal, making them a great option for filing. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #90; Security Tinted: No.