Oh my, seeing these made me remember my childhood where I also used to collect those caps. But we don't collect them like this, but we flattened those metals then play with it like that. Can't remember much how we played with it but it's really fun. Another is we could use this as an instrument while going house to house during christmas season while singing. Though I never experience that going house to house but flattening those metals only. It is really a fun plaything to us Pilipinos 🤩.