Print with confidence. The blue Avery Sure Feed grip strip is designed to help prevent jams in your printer. Quickly and easily create your own customized labels with these 2x4 labels featuring TrueBlock technology that will completely cover everything underneath. Not only will you have a clean professional look but you can reuse packages and envelopes as well. Avery 2x4 labels have a permanent adhesive backing that can hold onto envelopes cardboard paper plastic glass tin and metal. This bulk pack is great for high-volume shipping and mailing jobs as well as for other labeling and organization needs for home school and in the office. Also available in smaller pack sizes. In addition Optimized for laser printers it s easy to personalize your labels with logos graphics or images using the free printable templates and designs on the Avery site.White rectangle labels can be used for a variety of things including labeling food products jams sauces for classroom projects product samples medical labeling to identify personal belongings make goody bags name tags and of course for mailing and shipping.