Types of Steel Used in Knives.

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Knife Disarming by Steve Tarani
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Russian Martial Art_Systema_Knife Disarming with Frank Arias
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Carlo's Art: Knife disarming with arm triangle
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Knife Disarming and Takedown
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Krav Maga Knife disarm
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Senkotiros knife disarming demo
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Knife disarm from the ground at SSMA/REBD
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Bojuka Close Quarter Combat - Knife Self Defense Technique
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Seen on MT: Here's a chart (http://spyderco.com/edge-u-cation/index.php?item=3) on different metals used in knives and what their components are, courtesy of Spyderco.