The second one looks like an option, I’m not sure I’d like the material of the first one. Are there any like the second one that have a bit of cushioning, like a squishy outer layer? Although I guess they might be slightly girthier. Don’t spend ages searching though, it’s a bit specific!
Ooh - what about this one? It’s silicone, flexible and 3" circumference!
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This looks promising 
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