Review on Enhance Your Crochet Skills with KOKNIT Crochet Hooks Set (14pcs Crochet Hook) by Carrie Spencer

Q: Can someone who knows more about crochet than me explain the difference in the size of the top three hooks? (I've also included a separate image of these three.) They don't seem to fit the structure of the other numbers. I apologize for my ignorance but I'm new to crocheting. The writing on one of them isn't very good for a new hook, but I think the numbers are legible enough to hopefully answer my question. I couldn't imagine this question without a star rating so I only gave it 3 mainly because the imprint is not as clear as I would like (old eyes) and one of them is brown and very difficult to see. Many Thanks.