What is the best object to use to tickle someone with?

What is the best object to use to tickle someone with? The most ticklish spots tend to be those that are also the most sensitive, like your: Feet. Neck. Ribcage. Many people find small, blunt, brush-like objects like back-scratchers and even hairbrushes and combs to be very ticklish, along with small rod-like objects like pencils. You'll need an object that you can lightly run across a ticklish surface like the bottom of your foot or your neck. This still won't feel like you're being tickled in as intense of a manner as when someone else tickles you, since you can't trick your brain! These objects work better on lower-body tickling, particularly on the soles of their feet. Find a hairbrush with rubbery bristles, the kind with small balls on the tips and that fan outward (scratchy bristles made of horsehair and other materials won't work as effectively).

https://tickleinva.freeforums.net/thread/110/best-object-use-tickle