Adhesive-backed mailing seals are ideal for sealing folded flyers & brochures that do not need envelopes. USPS requires 1-1/2" seals on pamphlets (two or more pages in flyer). These 1-1/2" diameter seals dispense easily from a 3" core roll, fold for application, & facilitate easy opening of mailing without damage. Seals are designed for use with the Tatco Mailing Seal Dispenser (sold separately), which separates seals from backing for quick, easy use.