Here is a tactical arm guard that helps you defend yourself against dangerous objects coming your way. The Shindn Aluminum Alloy Tactical Arm Guard has a lightweight design and is fixed on your arm with two elastic bands and velcro. It measures 16.5″ long and 6.7″ wide.
This arm guard has 3 zinc-manganese alloy bars with serrations. It also has a tungsten steel and diamond head. You can find out more about it here.