Glow yarn: Crochet yarn You need to expose the glow in dark yarn completely to the sunlight for 15~30 minutes to fully absorb the light Size:Polyester,1Pcs 100g/3.5oz,85M/92Yards,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,colourful is very special