Seiko SmartLabel SLP-SRL Shipping Label - Shipping labels help you avoid package shipping headaches by allowing you to rapidly produce customized shipping labels. Strong adhesive securely sticks to your envelopes. Address labels are designed for Seiko SLP 450, 440, 430, 420, and 200 series, SLP EZ30 and Dymo Labelwriter 300 and 400 series printers.