The Hasler 220 envelope sealer is a proven workhorse. It seals up to 120 #10 envelopes per minute and there is no postage meter required. It will handle envelopes up to 10" x 13" in size and up to 1/4" thick with a flap depth of 2 7/8". The Hasler 220 envelope sealer is a user friendly, reliable and extremely durable unit with a monthly duty cycle of 35,000. We used one in our office for 6 years and never had a service call!