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.