Avery's white laser shipping labels feature TrueBlock technology, an opaque backing that ensures complete coverage of used labels and lettering underneath, allowing you to reuse cartons and envelopes. The bright, white labels resist smudges and smears, giving you consistently beautiful and professional looking results every time. Smooth-feed sheets run smoothly without jamming, protecting your printer and saving you time whether you need to print one label or 150. The generous 3 1/3" x 4" size includes room for your business logo and lettering. These labels also feature exclusive Avery Sure Feed technology to improve print alignment and avoid jamming.