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ferrule noun

  /-ɹuːl/ , /ˈfɛɹ(ə)l/ , /ˈfɛɹəl/
  • (billiards) The plastic band attaching the tip to the cue.
casquillo
  • A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting. [from early 17th c.]
casquillo, virola
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