Size: 3 15/16″ x 6 7/8″ x 2 Mil Quantity: 100 First Day Cover Sleeves Description: 100 First Day Cover 2 MIL Crystal Clear Poly Sleeves for #6 Envelopes, 3 15/16″ x 6 7/8″ x 2 Mil.  A great way to protect your covers from finger prints, duct, smoke, pollution and many other contaminants the can harm your covers. Any First Day Stamp Covers shown are for illustration purposes only, they’re not included. Other Stamp supplies and albums are available in my Ebay store here .