This is a 10-hole harmonica. Size: Width: Approximately 10.5cm Height: Approximately 2.3cm My child received this from their music teacher, but instead of using it properly, they just tossed it around in the toy box. It's a waste, so I'm hoping someone will use it. Please consider that this is a used item that has been played with by a child and may have small scratches, etc., before purchasing.