This is a pale translucent sticky notes "Wisteria flower" made by kamidea, a popular Japanese stationery brand focusing on memos and sticky notes.
It is made of a special paper that allows the text and figures underneath to show through faintly.
The gentle, pale transparency creates a special atmosphere and adds color to your message.
The small 3 cm square sticky note is easy to use as a marker or in a notebook or bullet journal.

20 sheets (each sheet can be detached into 3 pieces of 30mm x 30mm square)