QwikStik by Compulabel Mailing Labels for Laser and Inkjet Printers, 1 x 4 Inches, White, 34 Sheets per Box (20 Labels per Sheet) (320095) QwikStik, by Compulabel (U.S. patents 6,860,050 & 6,837,957). Label sheets separate into individual strips to expose the ends of each label, simplifying the removal of the label from its backing sheet. Complete your mailing and shipping tasks in far less time whether you are right or left handed Labels are engineered for safe and highly effective use in monochrome and color laser printers, inkjet and photo printers, high and low speed copiers. Bright white labels will not jam Compatible with existing templates included in all the most popular software programs