When I started many years ago I used a rather slender leather stretcher with snaps. Since then I've used leather, rubber/neoprene/silicone and metal. I enjoy them all but tend to use rubber ones when not doing weight and either leather for light weight or metal for heavy.
I would recommend starting small and/or light and working your way up to the heavier stuff if that's your goal.

I've gotten several from here: https://www.thechaingang.com/adult-adventure/male-body-jewelry/ball-weights-and-ball-stretchers.html

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i also stretch and would like to skype cam chat if you want
I found this site very useful

https://www.secretleather.com/jarod-johansens-ball-stretching-guide

the trick is to start lite and small

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