PDF catalog for the AiryString has a lot more details and technical information. https://ykkdigitalshowroom.com/assets/AiryString_202507_en.pdf https://ykkdigi

PDF catalog for the AiryString has a lot more details and technical information. https://ykkdigitalshowroom.com/assets/AiryString_202507_en.pdf https://ykkdigitalshowroom.com/assets/AiryString_202507_en.p... It looks like there is a core cord inside the zipper teeth. The specialized sewing machine stitches the cord to the fabric in between each teeth... tooth?