What are vinyl kettlebells made of?
I'm looking to buy some kettlebells but I'm a bit confused.
On a website I was looking at, some bells are clearly made of cast iron- they look like it, they're on the more expensive end and also the description is clearly indicates the material they're made of.
On the other hand, there are some "Vinyl coated" bells that look good, but I'm not sure what they're made of as vinyl is the only thing that mentioned.
They are a bit more affordable than the ones mentioned above, but in the pictures they look small and compact so I don't believe they're filled with sand (or whatever powder they put in).
Is there a way to tell the material? If it's allowed, I'll add the link to the product I was looking into.
EDIT:
This the set I looked into:
https://www.elverys.ie/products/rival-vinyl-coat-kettlebell-intermediate-set
This is the page of just the 8kg that is part of the set. In the images of the lady holding it and the hand grabbing, it look quite small so I presume it's iron:
https://www.elverys.ie/products/rival-vinyl-coated-kettlebell-8kg
What do you think?