There is a Fireworks components company in Spain that mades products to build almost any kind of commercial firework like shell casings, rocket headings, mortars, mines, roman candle spacers and many others.
The company I'm talking about is Plasticos Gamón.
I remember the time I was living in Portugal, there are many local companies that uses products from them.
Please take a look at their website for more information: https://www.gamon.es/
They have a big list of products you can search for: https://www.gamon.es/productos/
A spherical shell casing (image from https://www.gamon.es/)
A cylindrical shell casing (image from https://www.gamon.es/)
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