Wool Yarn
Yarn
noun
When you have fur string (aka string made of fur) what do you think of? Hopefully wool yarn.
The readings for these kanji are the kun'yomi readings. With 毛 you should have learned this reading via the vocab word in the previous level. With 糸 it's actually the main reading for the kanji, so you should already know it.
ピンク色の毛糸を下さい。
Please give me some pink wool.
おばあちゃんが自分で作った毛糸のブランケットをくれました。
Grandma gave me a wool blanket she made herself.
このジーンズ、本当は毛糸でできています。
These jeans are actually made of wool.