High Density Weights are developed and created by Mei Hatsume who won a competition for the best design.[1][2]


The weights are ultra compacted to make them easy to wear around someone's arm or legs. They were used by U.A. teachers to reduce their speed and drain their stamina to give the students a handicap during final exams.[2]



  1. Boku no Hero Academia Manga: Chapter 61
  2. 2.0 2.1 My Hero Academia Anime: Episode 34

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