Glass Bead Blasting
It looks like the image shows two surfaces, possibly metal, that have undergone different finishing processes. Glass bead blasting might be one of the techniques applied to one of the surfaces, giving it a smoother, matte appearance compared to the other.
Glass bead blasting is a surface finishing technique where tiny glass beads are shot at high velocity onto a surface to clean, smooth, or polish it without causing significant material removal. It's widely used for metal finishing, giving surfaces a uniform, matte appearance while maintaining the material's integrity.