Salt-and-pepper toupees: why synthetic grey holds its color and human grey doesn't
If you've worn a salt-and-pepper system through one summer, you've probably watched the grey go yellow. Human grey hair is thirsty stuff. It pulls pigment out of shampoo, styling product, even city air, and a few days of real sun turns it brassy. The blend you worked to match drifts off, and the piece starts announcing itself.

So our stock salt-and-pepper units use synthetic grey fiber instead of human grey. It can't absorb dye, which means there's nothing to stain it, and UV doesn't yellow it. It dries matte rather than with that plastic doll-hair shine, and because it's memory fiber it keeps its shape instead of frizzing out at the ends after a few weeks.
On the supply side: we're a Qingdao factory, the largest men's toupee manufacturer in China, and we keep a US store so North American orders don't sit in limbo. Stock runs 124 colors and a little over 4,000 SKUs, about 2,500 of them grey blends, with 45,000 pieces ready to ship. Grey ratio goes from 5% to 90%. If your temples are 20% and your crown is closer to 60%, you pick a number — you don't commission a custom run.
Two things we do to every unit regardless of price. The hair gets a 60-minute cuticle removal, which is what keeps it soft instead of drying into straw by month two. And the hairline is bleached knot, so the front edge has no visible knots and no dark scalloping where the base starts.

We also stock small bases: 5x7, 6x8, 7x9, 7x10, 8x10. If you're covering a thinning spot rather than the whole top, that's the difference between a week and a month of waiting.
Outside what's on the shelf, we take custom orders one-on-one — different base, different density, a grey mix we don't stock. But most people end up asking the same two questions: will the grey hold, and how fast does it ship. That's what the stock is built around.