flyweights

/F L AY1 W EY0 T S/
noun
  1. 1

    A weight that moves outward depending on centrifugal force.

  2. 2

    A weight class in many combat sports; e.g. in professional boxing of a maximum of 112 pounds or 50.8 kilograms.

  3. 3

    (adjectival use) Small, light or unimportant.

Source: https://en.wiktionary.org/wiki/flyweight, https://en.wiktionary.org/wiki/flyweights