These are U.S.A.F.. 1/6th scale helmets
This one is an inexpensive model --not top of line
Most are plastic but some are metal depending upon the mfg'er.
They average 2 1/2" x 1" in size
Stands or bases are not provided unless so stated.
1/6 th scale is based upon Cotswold 1/6 sizing --- just slightly larger than the Dragon series-- no other (hgu- 33) series are available.