YKK 1 way separating zipper.
#4.5 Nylon coil, polyester tape zipper.
This would be a good replacement zipper for jackets, ski coats, kids items.
4.5mm is a bit smaller & more flexible than a standard jacket zipper which is usually 5mm or 7mm.
Easily shortened from the top for your project. Videos above to help you shorten your zipper.