Floating ball game - Set of 4

What happens when I blow hard into the tube and what, if I hold it at the same time inclined? The floating ball game trains the lungs and has a logopedics effect.

Brand: Goki

Age: 4+

Dimensions: 15 x 3.7 x 4 cm

∅: 3 cm

4 assorted styles (sold individually)

Materials: Wood, Plastic

Article number: 15377

This item is sold individually and assorted.
Each piece is selected at random, so it will be a little surprise which one you receive.