Business Source No. 9 Double Window Invoice Envelopes - Pack of 500

Business Source No. 9 Double Window Invoice Envelopes - Pack of 500

Marsoni

M251S

$152.20

Get it in 3 business days with 1 day shipping. Friday, May 29

Business Source No. 9 Double Window Invoice Envelopes - Pack of 500Enhance your mailing process with our No. 9 invoice envelopes featuring double windows for both the return address and mailing address. Designed to be compatible with most standard 8 1 2" x 11" computer generated invoices and statements, these envelopes offer convenience and efficiency. The top window (1 3 16" x 3 1 2") is strategically positioned 3 8" from the left and 2" from the bottom of the envelope, while the bottom window (1" x 4") is located 3

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
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I use this on many builds to dampen the metal echo in cars, vans, and trucks. Just one sheet in the center of a body panel is a huge difference maker. You can also cover the entire surface and get added insulation value. The noise is greatly depleted and it's easy to install with a roller tool. Looks Great when done. Good Product I will use again!

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Reviewed in the United States on December 29, 2025

Verified Purchase

chris cook

Carnegie, US

★★★★★ 5

Great, affordable upgrade

Style: 36 Sqft 80 mil

Easy to use and install. Great upgrade

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Reviewed in the United States on May 8, 2026

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Sbushlnzl

San Leandro, US

★★★★★ 5

Nice sound deadening, self adhesive mats

Style: 18 Sqft 80 mil

These mats should work fine for my application. I’m applying it to the back sides of the hollow core doors on the closet where my HVAC is installed to reduce the “hum” from passing through. If I were sound deadening my automobile, I would probably use a heavier gage material. Overall, good product at a reasonable price.

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Reviewed in the United States on March 21, 2026

Verified Purchase

vivian johnson

Cuba, US

★★★★★ 5

Very good product

Style: 36 Sqft 80 mil

Easy to install, very sticky. Will buy again.

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Reviewed in the United States on May 20, 2026