Desktop reference system with 10 Sterifold white-framed display pockets. Thanks to exclusive technology, the silver ions included in Tarifold’s DA221 display pockets deter microbial growth by eliminating micro-organisms. Sterifold display pockets will release antimicrobial silver ions every time bacteria, mold, or fungi appears on the surface of the pockets. Silver ions will do the following to the microorganism: attack the cell wall; interrupt metabolism; prevent reproduction. For optimal protection, we recommend the Sterifold display pockets be replaced every 2 years. Especially suitable for environments at high risk of microbial proliferation, including restaurants, medical, and pharmaceutical environments. 10 year product warranty.