In this pattern, we use a 3 mm crochet hook for the raffia yarn. If you are using fingering weight yarn or sport yarn, you can easily use a 3 mm crochet hook. If you are replacing the raffia yarn with light-worsted or worsted-weight yarn, you will need to use a larger crochet hook, 4 or 5 mm. Please read the label of the yarn to check the recommendations on hook size.