These are the stock, four-piston, radial-mount GSX-R1000 Tokico calipers for the Black Arrow. They were roughly ground flat when I bought them secondhand. I've wet and dried them, then sent them to Matt B, the owner of a bike I featured for PB, who had the Tokico logos engraved into them. It's a tiny detail, in the overall scheme of the bike, but I love it.
Next they'll be bead blasted and hard anodised. G