SIJO Waysun Johnny Tsai is a Chicago native and the founder of C.U.M.A. Combatives and the C.U.M.A. Survival School. A Master level Instructor, Sijo has over 33 years of combined experience in teaching practical street defense in the civilian, military and law enforcement sectors and is considered one of the World's foremost experts in practical street defense and Combatives. He is a published book, magazine and DVD author, as well as a highly established impact and edged weapons designer. Sijo has knife designs on the market and available through TOPS Knives, Slysteel Knives, Day One Gear, Combat Ready Knives and Grunt Style.
T.A.S.K. Knives BREACHER CLEAVER: Half Axe, Half Cleaver…100% Brute Story and Photos by Waysun Johnny Tsai Over the past two years my social media feeds have been filled with images of some... Read more
The TOPS Knives Hammer Hawk is a Tool Suitable for Any Worksite Story and Photos by Waysun Johnny Tsai and TOPS Knives Over the past 20 years, the good folks at TOPS Knives have developed a... Read more
The Benchmade Knives 173BK Mini SOCP Dagger Is a Force to be Reckoned With Story and Photos by Waysun Johnny Tsai Greg Thompson’s SOCP Dagger family has built a reputation of being a self-de... Read more