An excellent tool to practice your grip: The Judo Uchikomi Exapander. Made 100% out of cotton, the rice grain structure gives the perfect feel of a judo gi. Designed to strengthen upper muscles as well as to help train the uchikomi technique without a partner.
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Strong: 3/4" (9-11mm) diameter and approx. 12' (4m) length
United States Design Patent D738,978