Kegel balls, for the training of women's musculus pubococcygeus, (Kegel exercises), placed beside a 58 mm match box
<a href="//commons.wikimedia.org/wiki/User:Boberger" title="User:Boberger">Boberger</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>