These Quality Park™ envelopes have resealable Redi-Tac® closures for a modern take on interoffice mail. Save time and keep office memos circulating without metal clasps or string and button closures. Redi-Tac® interoffice envelopes will open and close effortlessly through thousands of uses. Durable 32 lb brown Kraft stock holds up to prolonged daily use. Seam Type: Center; Flap Type: Cheese Blade; Trade Size: #97; Security Tinted: No.