PERFECT FIT: Each pack contains 50 outer sleeves. Vinyl record outer sleeves measure 12.75” x 12.75”, perfect for 12" vinyl records and most single LP, and double LP. ACID-FREE DESIGN: The record sleeves use an acid-free process to prevent your vinyl record and album cover from fading over time. CYSTAL CLEAR: With material of polypropylene, provides the vinyl record sleeves transparency, not cloudy. Ensuring your vintage album and cover art easy viewing and storage management. RE-SEALABLE FLAP: Adhesive is Located on the bag, not the flap, to eliminate contact with album cover when removing. Can be resealed many times over. Multi-PURPOSE: These clear plastic bags are designed to comfortably fit picture mats, posters, cards, documents, papers and many other important articles. Protect the appearance of your articles from damage. Here's a quick reference to make sure you know exactly what you're getting when you buy this Collector Protector Album Sleeve. 1, Sleeves come in varying materials and thicknesses. OPP Poly bags are shiny and extremely clear. They are more stiff/rigid thus they hold their shape and are less prone to wrinkling or fingernail dents than softer material such as PP, PE, HDPE or polyethylene. 2, They are less pliable than the softer bags which means they will split at the seams easier. However, careful handling will prevent most of these splits. 3, They will hold their clarity longer than other poly bags which tend to become more milky or yellow over time. Don't be confused between transparent and translucent. Our bags are transparent. Overall, if you want to make your covers look the best they can, while providing great protection, you'll be happy with this product. Thanks for your interest in our sleeve. We are happy with it, and hope you will be too.