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By certification 
The SANHONG
Grappling and Judo mat was designed to take the throws of Judo, Aikido, Hapkido, Jujitsu, and similar martial arts disciplines. Official Judo mats are the preferred mats for major tournaments worldwide suchas Olympic Games, world championships and European cups events. The mats have become popular in schools and dojos nationwide because they provide competitors the opportunity to work out on the same mat as they will compete on in even the major tournaments. Sometimes, they are referred to as Grappler Mats.
Top quality materials and superior workmanship guarantee years of use. High density polyurethane foam makes them terrifically durable and super resilient. Rubber waffle anti-slip bottom is permanently attached.
http://www.qdsanhong.com/
