Silver dillinger tampers are vacuum hardened - they are about 3 times harder than a normal tamper. Black dillinger tampers are vacuum hardened and then have a diamond-like-coating applied - they are about 5 times harder than a normal tamper. When we say dillinger tampers are tougher than nails, we mean it!
Dillinger tampers are made from vacuum-hardened stainless steel. The black ones are plasma coated with a diamond-like coating. It was developed for the machining and aerospace industry (think space-flight, jet engines, machine-tools). It is so hard that the hardness measurement is off the Rockwell hardness scale (the measurement scale used by engineers to decide how tough something is)!
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