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- No. 10 ( 4 1/8 X 9 1/2) Postage Meter Flap Down Window Envelopes AKA: Upper Right-Hand Window
- 500 Security Envelopes for Inkjet Printers Only
- Standard (1-1/8" x 4-1/2" Window) positioned 4 1/8 from left and 2 1/2 from bottom When Flap is UP
- Premium 24lb White Envelopes with Blue Tint and Gum Flap
- Made in USA
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