2PK OfficeSmartLabels Black 4.33" x 244' (Width x Length) Thermal Resin Ribbon Compatible with Zebra Desktop Printers Resin 4.33 Inch x 244 Inch Core size: 1/2 Inch Delivers excellent smudge and scratch-resistant performance in your most demanding applications. Waterproof, grease, chemical and solvent resistant. Use with polyester and synthetic labels. For use with desktop printers. 1/2 Inch core size. Wax Ribbons: recommended for shipping labels, carton labeling and retail bags. Wax/Resin Ribbons: smudge proof. For use with color labels. Resin Ribbons: waterproof, grease, chemical and solvent resistant. Use with polyester and synthetic labels.