Android action bar icons resolution

I found following website that shows all the resolutions for action bar icons:

https://iconhandbook.co.uk/reference/chart/android/

24 × 24 area in 32 × 32 (mdpi)

36 × 36 area in 48 × 48 (hdpi)

48 × 48 area in 64 × 64 (xhdpi)

72 × 72 area in 96 × 96 (xxhdpi)

96 × 96 area in 128 × 128 (xxxhdpi)

but I wish to make smaller icon size then the standard ones and i am not sure which to choose for xxxhdpi:

is the let size is the size of graphic inside of right side frame?

[1]: https://i.stack.imgur.com/R2lfL.jpg