They are purple and pink juggling pins used by Clown Drop to perform the homing technique "Juggling Party". In some episodes of Doki! and beyond, Clown Drop uses these pins to spin and reflect off attacks from enemies.
This is the first attack Rima was seen using in both Anime and Manga. Kusu Kusu can be seen juggling with similar pins in a few episodes.
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In a few episodes Rima uses Juggling Party to break X-eggs