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
No. Pull ons. Zippers rust.
Zippers don't have a 'hand'.
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