This is a ball used by girls to play handball called Temari, or made as an ornamental object for girls event Hina-matsuri.
 
Itomari (Threads ball) is a type of ball made by using thread wrapped around a rolled cotton core, and has been developed as a plaything for girls since the Edo period.
 
This one made of beatiful silk threads.
 
Measures: 6cm (2.3in)