Yellow outer surface/White inner lining Unsurpassed Water & Tear Resistance - Superior side seams combined with Heavy Duty 100% Virgin polyethylene make these Premium Quality envelopes highly resistant to water, punctures, and tears Pressure sensitive self seal with Anti Static Release Liner - Easy packing, tamper-evident, and super secure closure Light Weight & Time Saving - Lower shipping costs combined with faster shipment preparation equal big savings. 100% recyclable