Monofilament Clear Thread 2000 Yard Nylon High Strength Fishing Twine A semi-translucent quality that helps them to blend in with the fabric that you are sewing Fiber type Nylon, size 0.2 mm Recommended Needle Size: Singer 16 - 18 // Metric 100 - 110 Main Uses: Label attaching, All kinds of serging, seaming and blind-stitch operations Certified by OEKO-TEX Standard 100, safe product for all ages