i kind of like this kind of zip, first it look vintage, and second it can be "locked" once u press it down
中间那个是自己编织的lace， 也是用缝纫用的线， 4条线一起编织。
the lace at the middle are knitted by myself, i use normal sewing thread, four lines of them, but u may add as many as u want for the thickness.
just some simple design
simple is hard to express sometimes.