ProLabel Brand Meets new US Postal Service regulations for mailing seals 1.5" Round can be hand applied or by machine Top quality ProLabel Brand wafers - 4000 labels per roll 7" outer dimension, 3" core Clear frosted translucent paper wafer tab mailing seals for booklets or brochures ProLabel Brand 1.5" round clear frosted mailing seals to meet new postal regulations for sealing brochures and magazines. Not perforated, but will tear as per USPS regulations. The postal service announced that to improve the productivity of processing booklets and to decrease damage to mailpieces, the new standards require that booklets have three, 1 1/2-inch tabs placed on the sides of the mailpiece. In addition, under the new standards, to minimize tab failure, tabs used to seal booklets paying automation or machinable prices may not be perforated. Tabs with perforations are easily broken, do not maintain their integrity, and are damaged in transport prior to entering the mailstream. Therefore, only solid tabs made of plastic, vinyl, translucent paper, opaque paper, or cellophane tape will be acceptable. Great for postal mailings! Please view other photos on this listing to see the transparency of the label once it is applied to a new surface.