Those are Byron's "Vintage" boot grips. I bought a set for a RB N frame years ago. They're extremely compact and were closed out for under $10.
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This. ^^^^
I have large hands and don't really like boot grips as a consequence. The smooth portion from toe to heel of these grips allows pinkie purchase and a secure hold.
Excellent ergonomics, highly recommended. I will be restoring my example and putting into rotation.