High Quality: 4x6 thermal labels are made of upgrade material that you can print crystal clear images and easy to scan and easily to peel off due to perforated line. High-quality thermal labels can be printed clearly, peeled off easily, and pasted firmly, bringing convenience to your business development. Label Size: 4"x 6" (101.6mm x 152.4mm). 450 shipping labels per roll. Tips: It is only suitable for thermal printers, not laser or inkjet printers, not for Dymo printers. BPA FREE: BPA (Bisphenol A) is an industrial chemical. It can cause endocrine disorders and have certain effects on people's health. Muotich direct thermal paper has passed RoHs certification. It has been tested that the paper does not contain any carcinogens such as BPA or BPS. Ultra-Strong Adhesive: Peel-and-stick extra-large labels with strong self-adhesive backing. They use premium-grade and powerful adhesive that allows each label to stick tightly to any packaging surface for a long time. Wide Compatibility: 4x6 Thermal Labels compatible with Zebra 2844 Zp-450 Zp-500 Zp-505 for shipping. USPS, UPS, FedEx, DHL Amazon, eBay & PAYPAL Approved. 4" x 6" Direct Thermal Labels  White Perforated Postage Shipping Labels for Zebra 2844 Zp-450 Zp-500 Zp-505 Thermal Printer Size: 4"x 6" (101.6mm x 152.4mm). Color: White. Material: Paper. 450 shipping labels per roll. Tips: It is only suitable for thermal printers, not laser or inkjet printers, not for Dymo printers.