The device is made of gray plastic that is made to appear like metal. Hopefully, a potential thief with a passcode or master key would think twice about defeating the Milockie Hotel Safe because it is not foolproof. The nylon strap could possibly be cut without much effort with the right tool. The nylon strap already has some weakened sections after being installed and removed just a few times. A strap made of Dyneema material would have been better and a metal shield around the vulnerable section of the strap could have made the Safe Lock harder to defeat. A bit pricey but might be enough to deter an opportunistic and time-constrained thief.