Plastic Letter Opener, Envelope Slitter With Concealed Steel Blade - Green - 9 Pack. By Mega Stationer EFFICIENT and PRACTICAL: Slices through paper envelopes, letters, and packages of any size. EASY TO USE: Save time and energy with Mega Stationers manual letter opener. Concealed steel blade for safety. DIMENSIONS: Each cutter separately measures 2 1/2 in. x 2 1/4 in. Pack of 6 letter openers. HOW TO CUT: Insert bottom piece of the opener under the envelope flap and slide cutter along it. 18 MONTH MONEY-BACK GUARANTEE! Mega Stationers is a brand you can trust. If you are not 100% satisfied with your purchase we will issue you a full refund- hassle free!