Due to the current world we live in, Washington Security Products, Inc. has added an antimicrobial agent to its Standard Side Opening Carrier. Hopefully this will reduce the transfer of bad things from person to person. It is the end user’s responsibility to determine if the product is right for them. The antimicrobial agent will last for 10+ years. All carriers are date stamped at the time of production and if there is an arrow on the carrier body, then you have a carrier body with an antimicrobial agent added. God Bless America! Please see here and here for documentation on the antimicrobial agent or visit https://www.biocote.com/biocote-antimicrobial-additives/ for more details.