Glow in the dark: 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, Size :Polyester，1Pcs 50g/1.76oz 10Pcs in Total 520g/18oz, 546 yards, Suitable for beginner yarn with 2.5-3mm crochet hook Difference: knitting yarn of different colors reflect to the eyes with different light sensitivity, white is the most obvious.