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Buy Knife
C.U.M.A. KNIVES are designed by Waysun Johnny Tsai. Since 2010 these knives have been collected, used and abused by tens of thousands of knife fanatics around the world.
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Need a Writer?
Waysun Johnny Tsai published his first book in 2008. Since then he has become a freelance writer for over a dozen magazines and has had over 200 articles published. If you are looking for a writer, Sijo is your man.
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Consultation
Waysun Johnny Tsai has spent nearly three decades as a contractor and security industry consultant at every level from executive protection to governmental agencies, developing school safety and active shooter training programs across the midwest.
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Defense Class
Defense classes are available at different levels, from private and personal self defense classes to training law enforcement agencies and large private or corporate groups.
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