Mitsuwa Marketplace (Japanese Grocery)
$1.79 Japanese Rice Paddle
Slightly curved spoon shape with bumps
The bumps are are short and close together for easier rubbing
Not flat, so it holds a little water in place like a mixing palette
2.3x7"
I searched for ceramic paddles thinking they would not stain, but they seem to have fewer bumps and their surface is probably too smooth to rub on