Atkinson Designs Zippers by YKK have a polyester coil and tape.
Lazy Girl Patterns use Atkinson Design Zipper with their patterns Quote from Lazy Girl
My top recommendation for zips is YKK brand zippers from Atkinson Designs. They are the smoothest and swapping tape and pulls works beautifully with them.
They are flexible, strong and durable with split resistant coils and low shrinkage. Metal pull tab. These zippers can be cut to fit the size that you need for purses, skirts, dresses, pants, sportswear in most weights of fabric, crafts and home decor.
Assorted candy colors* of zipper pulls for Atkinson Designs Zippers.