How do I make the white parts of this cake? It's so precise it looks difficult if it's with royal icing.
On the bottom cake the middle part of it looks like a stencil with RI and the rest like its piped. Dont know about the top tier
Looks to me to be a stencil. The way I know how to do these is with royal icing (although I think some use buttercream)
Basically, you just hold the stencil against the cake and lightly "paint / spread" the icing against the pattern. Then you peel off the stencil.
There are a couple you-tube videos on it.
As the others said, It's a combination of using a stencil, then accenting it piped dots.
I agree with everyone too... stencil and accent piping!