Instruct: Classify the given review as either positive or negative.
Query: Not for Long and Thick Hair

These jumbo rollers are very easy and convenient to use, the box is small and light, so you can definitely take them with you on your trips. However, there is one thing you need to know before you purchase this product: it is completely useless on long and thick hair. I have tried heating them for over an hour and leaving them on my hair for over 2 hours. Still, when I take them off, there wouldn't be a slightest hint of a curl in my hair. My hair is naturally wavy, but after using these curlers, it would actually get straighter.I have tried using them on dry hair, slightly wet hair, right after washing my hair, two days after washing my hair, with or without product - all to no avail. I have tried using them on only half of my hair, as some readers have recommended but the result is still a slightly straighter hair and no trace of a curl.So if your hair is long and thick, this is definitely not a product for you.