The black topo 1.75u keycap is a bead-blasted and anodized aluminum Cherry profile R3 keycap.
The brass topo 1.75u keycap is a bead-blasted brass Cherry profile R3 keycap. The brass is not coated.
These keycaps fit any switch with an mx style stem.
This group buy will run until February 20th with delivery aimed for 6 weeks after.