Made by Uline. Specs:

4" x 6" size.

1" core, 115 labels per roll.

Direct stick permanent adhesive.

Perforations between each label.

Works for all thermal label direct shipping label printers: Zebra, Rollo, Core Innovations, Eltron. UPS, Fedex, USPS, DHL, package compatible. 

Available in packages of 1, 2, 5, 10, and full cases of 25.