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The divot is just the right depth for my thumb, and the smooth finish makes it perfect for mindless fidgeting during long phone calls. I've noticed I'm reaching for it less throughout the day because it actually helps settle my nerves.

I keep this in my pocket during meetings and rubbing my thumb in the divot actually calms me down. It's about 1.5 inches, so it fits nicely in my palm without being bulky.

The divot is perfectly sized for my thumb, and I catch myself rubbing it during conference calls without even noticing. At 1.5 inches it disappears in my pocket, which is exactly what I wanted.