Glow in the dark: Crochet yarn You need to expose the yarn completely to the sunlight for 15~30 minutes to fully absorb the light, put it in the dark and you will get a surprise. Glow yarn: Crochet yarn You need to expose the glow in the dark yarn completely to the sunlight for 15~30 minutes to fully absorb the light Difference: knitting yarn of different colors reflect to the eyes with different light sensitivity, white is the most obvious,colourful is very special Size:Acrylic,1Pcs 100g/3.5oz,240M/262Yards,worsted fine #2 Yarn,suitable for beginner yarn with 2.5-3mm crochet hook Diy:It is suitable for making all kinds of glow-in-the-dark things, handmade dolls, hats, jewellery, carpets and so on. Service: If you are not satisfied with the place to contact us, we will serve you within the shortest time. ASIN B0FPCXKXJS Color Black Brand Name bulingbuling Unit Count 82.0 Feet Item Length 3 Inches Manufacturer Velve Material Type Acrylic Material Composition 100%Acrylic Warranty Description 1 Year Product Care Instructions Hand Wash Only