Review (4/5): Easier if your hair is shorter than 22", but still useful for longer hair
These curlers extend out to around 20" so hair that is any longer than about 22" will end up having a strange gap between where your roots are and the curl begins, depending on how you place them. I usually line them up so I have that strange gap, but use it to my advantage and just work things into an updo of some kind.
The curlers are flexible and comfortable enough to sleep in, just pop a bonnet on and you're good to go. The ends are topped with a silicone gasket-type end that grips onto your hair, preventing it from slipping once in place.
The hair grabber tool is basically a big crochet hook for your hair and has two parts you assemble by snapping them together. It is best to work in small sections, especially if you have thicker/dense hair so you can really maximize the curl these provide.
There are 20 in a bag, I'm not sure there's really much difference between the two colors in the bag. The curl this gives is really nice and gives great body after a day of wear.
Overall, these are a fun addition and a way to take some time off your hair routine in the morning.