Antimicrobial agent within the sleeves and sleeve frames to inhibit any microorganism growth on product surface Easy access to information you need every day - 10 sleeves display up to 20 letter-size sheets Easy expandable up to 60 sleeves using 10-sleeve Add-on Modules (sold separately) Glare-free document sleeves made of polypropylene for easy reading Included mounting wall bracket, wall anchors and screws for mounting