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Our First Day Cover Sleeves come in 3 materials, which are listed below. Each material has unique properties. Choose the material that best agrees with your current storage methods.

• Polyethylene is a by-product of natural gas. It is a soft clear material that has some give to it. It has excellent contact clarity.. Our polyethylene is made from 100% pure-virgin material.
• Archival Polyester (Mylar) an inert material of the highest clarity.We use DuPont inert Melinex® or a suitable equivalent. Polyester (Mylar) will not discolor, damage, or adhere to items placed inside it. It is a sturdy film that beautifully displays, timelessly protects, and gives extra support to fragile documents.Used by the Library of Congress.
Poly Vinyl is not recommended for long-term storage. When using Poly Vinyl we suggest you first put your item in a long-term sleeve made from Polyethylene or Polyester.


First Day Cover Sleeves - 2.5 mil Polyethylene
Description:
4 x 6-3/4". Fits U.S cover - # 6 envelope.
4 x 6-3/4". Fits U.S cover - # 6 envelope.
Base SKU: sfdcus6

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First Day Cover Sleeves - 2.5 mil Polyethylene
Description:
4-1/2 x 9-7/8". Fits U.S. cover - #10 envelope
4-1/2 x 9-7/8". Fits U.S. cover - #10 envelope
Base SKU: sfdcus10

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First Day Cover Sleeves - 4.0 mil Polyester
Description:
7-3/8 x 4-1/4".  Fits U.S cover - # 6 envelope.
Made from 4 mil crystal-clear archival polyester that has been approved by the Library of Congress for indefinite-term storage. Polyester is used worldwide in libraries and museums for the storage of paper products.

We use our unique Tuck-Lock™ design for these sleeves - closed beaded flap on one long dimension and open-ended on the two short dimensions. This design "locks" the cover in place, but allows easy insertion and removal when needed.
7-3/8 x 4-1/4". Fits U.S cover - # 6 envelope.
Base SKU: sfdcus6pet

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First Day Cover Sleeves - 4.0 mil Polyester
Description:
10 x 4-3/4". Fits U.S cover - # 10 envelope.
Made from 4 mil crystal-clear archival polyester that has been approved by the Library of Congress for indefinite-term storage. Polyester is used worldwide in libraries and museums for the storage of paper products.

We use our unique Tuck-Lock™ design for these sleeves - closed beaded flap on one long dimension and open-ended on the two short dimensions. This design "locks" the cover in place, but allows easy insertion and removal when needed.
10 x 4-3/4". Fits U.S cover - # 10 envelope.
Base SKU: sfdcus10pet

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First Day Cover Sleeves - Poly Vinyl
Description:
Use for U.S. Cover, #6 envelope.
Ultra-light weight 4 mil.
Made from semi-rigid, crystal clear vinyl. They are open on one long dimension and have a lip for easy insertion. This material is free of chemical softeners and is shrink-proof. 

Inside dimension: 7-1/6 x 4-1/4"
Outside dimension: 7-1/4 x 4-5/16"
Lightweight 5 mil Polyvinyl
Use for U.S. Cover, #6 envelope.
Inside: 7-1/6 x 4-1/4"; Outside: 7-1/4 x 4-5/16"
Base SKU: sfdcus6v

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