Durable thermal labels are scratch-resistant, smudge-free and resist water, dirt, dust and grease. Compatible with select DYMO, Seiko, Zebra and Pitney Bowes label printers. Packed in a secure bag to protect from light and ensure optimal performance. Permanent adhesive. Roll format with a 1″ core. Shipping Labels. Shape: Rectangular; Label Size – text: 4 x 6; Label Color(s): White; Color Family: White.