Protect your COVID-19 Vaccine Document by storing it in a protective acid-free poly holder. Unique 3-hole punch design allows the holder to be paired with a lanyard, keeping the document visible while attending sporting events or during travel. Top loading design makes it easy to remove the card to add additional information at a later date. Poly material is vital to preserving the documents information since it eliminates photocopy transfer from occurring. This means that the pen ink or label print will not transfer to the holder, which eliminates damage from occurring to the document itself. Unlike vinyl material, poly will not crack or wrinkle when exposed to extreme heat or freezing temperatures. Insert size on this clear holder is 4" x 3". Made in USA. 5/PK.