Best tickling instrument and it’s brand name?

[Guthwulf]

Hoping to find the most torturous tickling devices, so what are your favorite toothbrushes, paintbrushes, hair brushes, feathers etc. that you’ve bought and where can I get them? Share an amazon link or brand name if you can.

 

[gilmourwaters]

fingernails!...mine , yours , whoever has fingers....

 

[frankied21]

None of the above. I play guitar and one day was paying for a girl before a session and I was using my metal finger picks. Then it dawned in me. These work because they're long, metal nails. They're made by Dunlop. Trust me, you'll find nothing better