This is fine set of high-flange track hubs made by Dia-Compe in Taiwan featuring smoooooth sealed cartridge bearings. The rear is flip flop in the fixed/fixed variety with an axle spaced to 120mm you set up with a 42mm chain line. They weighing in at 604g for the pair.
Useful information for the Wheel Builder…
Front:
34.5mm Flange Width
62.3mm Flange Diameter
Rear:
32mm Flange Width
62.3mm Flange Diameter