Luftwaffe slip on Shoulder Straps for a Flak / Artillery Unteroffizier

An excellent matched and unissued pair of slip on Luftwaffe Shoulder Straps for a Flak / Artillery Unteroffizier
Trimmed with silver tresse the main body and straps are in a blue grey cloth whilst the underside is a slightly darker shade.
The waffenfarbe red for artillery.
It would be difficult to upgrade this set