Japanese gouge is the easy explanation

this example is oire sized (220mm roughly) they do come in tataki sized too (260mm roughly) 24mm Yasaku brand Miki city

sizes available oire 3,6,9,12,15,18,21,24,30,36,42 &48mm

Tataki 3,6,9,12,15,18,21,24,30,36,42 &48mm