The small version fits small electret microphones, e.g. Peltor 8006, the medium version fits standard electret microphones e.g. SL-30/40/50/Junior, Sennheiser series HME(C) 100/300, David Clark H 10-13.4. The large windscreen fits many dynamic microphones.
SL microphone windscreen medium
Fits for many GA headsets with standard electret microphone, i.e. SL-30/40/50/Junior, Peltor 7004/7006.