Hiroi Michiaki: This is… a pond snail and a loach.
Mrs. Hiroi: Mm. Pond snails are in paddy fields.
HM: It was a pond snail and a loach, or I have a feeling it might have been a horned turban snail and a loach…
MH: It’s a pond snail and a loach.
HM: And, um, this is the shell of the pond snail in the paddy and then the loach. You put those together and it [becomes] a top, and this… it’s a charm for protection against fire– these creatures live in the water, so [it makes it so] fires won’t happen. [This] top is that kind of charm.
***
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For video, see this page.