The featured unglazed Shigaraki bunny clay figurine has a small ceramic ball inside that makes soft sounds like a bell. The figurine is finished with whitish clay paint on terra cotta, and it stands approximately 3.7″ / 95mm tall and weighs about 100-200g.
You can find the figurine for purchase on Etsy here. The artist ships from Japan.
The artist also makes a full Chinese zodiac set of these animal figurines found here.