-- Be attention to avoid child eating.
-- For security, don't use damaged or transformed goods.
-- Do not use for other purpose.
-- Dispose of properly if you want.
And here are a few more I dug up from an email he sent once (also from a toy from the Japanese store):
1. Keep in dried places after clean it well.
2. Don't wind up too much, it causes broken.
3. Please understanding the natural wood likely to have the status of distortion, cracks, rot, rust, and other phenomena if the wood with water and wet.