Lot of 12 (6 pairs) U. S. Air Force First Sergeant distinctive device diamond shaped cloth insignia.  New in pack.  Used by U. S. Air Force from about 1978 - 1994.

SUBDUED COLOR

One measurers about 1 inch down the middle by about 5/8 inches from left to right at the center of the diamond.  NOTE:   Due size I believe these are the large male uniform size.