A few years ago, Italy published a set of standards classifying layered glass into three categories: shatter- proof, crime-proof, and bullet-proof. Given the variety of forms of attack, each class of glass had its own level of resistance, based on the number of strikes that can be supported before the glass breaks or the type of bullets and weapons it can withstand. Great Britain and Germany have similar standards for glass; the British regulations consider the entire structure consisting of the armored glass and the frame surrounding it, while Germany has paid more attention to the resistance of the stratified materials to attacks by unusual means. Banks have been among the first customers to install transparent armored partitions; other clients include museums and stores, which use the glass to display their exhibits and wares as well as protect them. In VIP vehicles, transparent layered materials are based on polycarbonate rather than glass in order to adhere to necessary weight restrictions.