oval weight to start. It's hard to get your first round weight measurement right, start with an oval if you go with metal.
Lots of rubber ones which is an easier start due to the pliable nature - easy out if you panic about it.
start off here; Secretleather ball stretching specialists
then come back & do a search here. Lots of threads & groups already exist here.
Good luck. Prepare to love it!
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