The shortened label leaves out the full grade and tells you little about the finished edge.
If a listing says only “7Cr stainless,” ask for the full grade and model sheet. The short label does not identify a finished shear’s hardness, coating, edge geometry, country of manufacture or service needs. A dark or coloured finish is not a substitute for a blade-material specification.
Hao Ming Special Steel’s 7Cr17MoV sheet describes one complete material designation: a chromium stainless containing molybdenum and vanadium. It lists 0.60–0.75% carbon and 16–18% chromium for the material it supplies. It also gives a heat-treated hardness figure for its product. None of those figures can be assigned to a scissor advertised only as “7Cr,” because the seller has not identified that full grade or the finished pair’s treatment.
Ask the seller for the exact model code, full steel grade, finished-shear hardness if measured, blade edge, coating type and local sharpening terms. Compare those details with a named 440C or VG-10 model that fits your work. A steel supplier’s 7Cr17MoV sheet does not establish that a particular hair scissor uses that grade, and the short “7Cr” label cannot justify a price or predict how long its edge will last.