40pcs Heatless Spiral Hair Curlers for Long Hair, No Heat Curlers 22inch/55cm Magic Curls Hair Rollers with Styling Hooks for Women Kids

Do you need to have wet hair?
It works better and easier with wet hair
How long do you need to keep them in for?
Firstly, dampen your hair before pulling it through the hair curlers.
Usually, you need to keep them for about 30 -45 minutes.
You could keep it for more or less time depending on how thin or thick your hair is
What size curl do these give? I'm looking for atleast a 1" barrel size, not very tight corkscrews
The diameter of this spiral curler is about 0.85'' - 1.0'' , but the curls created may be more than 1'' as it is also depending on how loose is your hair.