Perforated tabs have a small tear line built in, which makes it easier for the recipient to open the piece without tearing into the contents, good for self mailers or postcards where a clean open matters. Non perforated tabs seal tighter with no built in tear point, so they're the better pick when you want a tamper evident, more finished looking seal. Really it comes down to how your recipients will interact with the piece. Consumer mailers usually benefit from perforation, while more formal or secure mailings often don't need it. Q3: Does the tab material, translucent versus white paper, affect how the tabber runs? Not really. Both run through the same machines without needing different settings, so the choice mostly comes down to how much of the mail piece underneath you want visible. Translucent tabs are less visually intrusive on printed mailers where you don't want to cover up design elements. White paper tabs give a more opaque, uniform look, which works better when there's no printed design to worry about hiding. If you plan to switch between the two for different projects, just confirm your machine handles both. For the broader mailroom setup these tabs belong to, Mailroom Equipment covers related gear.