These are the "cb", "ci" and "ce" detectors used in the ReferenceDetector found here https://gitlab.com/eic/escalate/g4e/-/tree/master/src/subdetectors

Start with the USE = true https://gitlab.com/eic/escalate/g4e/-/blob/master/src/main_detectors/ReferenceDetectorConstruction.hh

DD4hep Shapes reference: https://dd4hep.web.cern.ch/dd4hep/reference/Shapes_8h_source.html

The reference detector central area https://github.com/eic/EicToyModel/blob/master/doc/EIC-IR1-XX-v01h.png