Based on clones from the BDGP Gold cDNA Collection (https://www.fruitfly.org/EST/gold_collection.shtml) recloned into the pDONR223 Gateway entry vector, the collection consists of over 10,000 clones.
See https://flybi.hms.harvard.edu/
A list of available clones can be downloaded from the DGRC: https://dgrc.bio.indiana.edu/include/file/DGRC-Gateway-clone-list-2021-02-10.xlsx