Any material sufficiently rigid and stable to perform the locking function.
metals used are aluminum and brass, and some hard plastics.
Sweden
They made buttons first.
Atleast a few million
People made zippers because they are easier to use and more efficient than buttons.
The zippers are on the back.
Zippers
Zippers don't have a 'hand'.
No. Pull ons. Zippers rust.
zippers, fridge, panama canal, ford Assembly line.
Zippers are typically made out of metal, plastic, or coil teeth attached to a fabric tape. The teeth interlock to close the zipper and create a secure fastening mechanism for clothing, bags, and other items.
Most metal zippers are made from iron alloys. I have even seen aluminum and zinc alloy zippers too.
There were 11 zippers on the jacket