Stands for Molten Tantalum Anti-material Round Version 1. Comes in various sizes. It is a handheld OR mounted gun round, can be HE, F, or whatever. The only difference from a regular bullet is upon impact it releases a stream of molten tantalum out the front (amount varies on bullet size, length of stream is equal to 90% length of bullet.) The actual bullet (a real bullet built AROUND the MTAMRs Tantalum core moving at real-bullet speeds) can be made of whatever material is required. Example stream length using 5.56x45mm bullet: It is about 5mm thick and it is 40mm long. Tested Penetration Depth (with a 9mm bullet going Mach 1.09 (higher calibers equals more depth (not exact for safety reasons))): Water/Ballistic Gel: 150mm Concrete: 95mm Rubber: 75mm Plastic: 70mm Kevlar: 55mm Titanium: 65mm RHA Steel: 50mm Diamond: 22mm