Invisible, closed end 4 mm YKK coil zip with plastic elements, plastic stops and a fine metal teardrop slider. Sew the zip at the centre front, back or side of delicate projects where you prefer to conceal the zip – e.g. in lightweight dresses, skirts, blouses and trousers. This zip is available in many gorgeous colours. In addition to clothing, use it in bed linen,cushions and similar items. For best results, we recommend that you buy this zip 5 cm longer than the opening in your project. Sew as close to the coil as possible, Use a presser foot specially designed for this purpose (article no. 46101 if you have a BERNINA sewing machine, and article no. 46172 if you use a BERNETTE sewing machine). The zip can be shortened. By the way, we recommend that you close the zip before washing. All our zips are certified according to STANDARD 100 by OEKO-TEX®. The metal parts are nickel-free.