For oversized envelopes, priority mail packages & boxes, LW Shipping Labels are big enough to fit your return address & logo as well as the recipient address all while meeting postal requirements. Direct thermal printing process helps you avoid the bother of messy, expensive ink or toner cartridges. Roll format lets you print one label or hundreds with ease so you can avoid sheet label hassle & waste. Labels are compatible with Dymo LabelWriter 330 Turbo, LabelWriter 450, LabelWriter 450 Turbo, LabelWriter 450 Twin Turbo, LabelWriter 450 Duo, LabelWriter 4XL & Desktop Mailing Solution.