G&K Glassline Envelopes, #6, 100 Envelopes.
Made from transparent virgin 30# glassine. Resistant to air and water, glassine contains no harmful chemicals and is transparent, thus allowing you to quickly identify the contents without opening the envelope.
With ungummed flaps. Strong seams, using anti-tarnish adhesive, Size: 6 3/4 x 3 3/4"