Red Heart Boutique Twilight Yarn Electric 61% Acrylic/25% Nylon/9% Polyester/5% Metallic Basic 3-ply acrylic yarn with added reflective thread wrap that makes this yarn reflect light aiding in nighttime visibility. Reflective component shows up amazingly well in flash photography. See for yourself how it lights up. Please purchase sufficient amounts as dye lots may vary.Recommended Knit Needle Size: US 15 (10mm) for gauge: 8 sts x 12 rows = 4 (10 cm) Crochet: 7 sc X 8 rows= 4 x 4 on size N-15(10mm) hook Meterage/Yardage: 59 yds... Washing Instructions: Machine Wash Cold, Gentle CycleTumble dry low, do not use bleach,do not iron