Two independent variables
Construction covers machine weft, Genius Weft, hand-tied weft, tape, K-Tip, I-tip and clip-in. Hair grade covers commercial, non-Remy, Machine Remy, Remy and virgin Remy. Every combination of the two exists on the market. A beautifully finished ultra-thin Genius Weft made from acid-stripped commercial hair is entirely possible to manufacture and is sold every day.
The confusion is understandable: high-end constructions are marketed alongside high-end hair, so buyers assume the two travel together. They do not, and the price of a finished weft reflects both variables combined — which is why two wefts of the same construction can differ by a factor of three.
How to buy around it
Separate the two lines on your purchase order. State the construction, then state the hair category, origin and processing history as a distinct requirement. If a supplier's quotation answers only the first, the second is unresolved.
Ask for the raw material stage to be evidenced, not the finishing stage. Everyone will happily film the weft machine; far fewer will show the sorting table the hair came off.
Buyer Questions
Is hand-tied hair always Remy?
No. Hand-tying is a labour method. It is often used on better hair because the labour cost only makes sense on better hair, but that is a commercial tendency, not a guarantee.
What should a specification sheet contain?
Construction, weft width and weight, hair category, origin, processing history, length, shade reference and lot number.