Thank you for viewing. I am selling these items as I clean out my parents' house. These are YKK Efron zippers. There are 11 zippers at 20cm and 1 zipper at 16cm, for a total of 12. These were from when my mother used to sew, so they are about 30 to 40 years old. Some of them are stiff to open and close. They are unused, but they are old. Please purchase if you understand this. ⚠️Please be sure to read the profile before considering a purchase.