7.5cm long, thick, black, strong, hairpins.
10 of them come in their original paper roll, which, when unfurled, proclaims
"WAVED
GH
HAIR PINS
invisible
ask again
for
GH
QUALITY"
I think "invisible" might be a slight over exaggeration.
I found a box of these in an old warehouse I cleared.
The odd pin may have a bit of rust so I'll add a few extra in with your order.