Hair curlers are styling tools used to create curls or waves in hair. They come in various forms and materials, each offering different results and suitability for different hair types. Here are some common types of hair curlers:

1. Hot Rollers: These are heated before being rolled into the hair. They come in various sizes to create different types of curls and are often used to add volume and bounce to the hair.

2. Velcro Rollers: These rollers have a velcro-like surface that grips the hair without the need for pins or clips. They are popular for creating soft, natural-looking curls and are gentle on the hair.

3. Foam Rollers: Foam rollers are lightweight and usually come in a variety of sizes. They are typically used on damp hair and are secured with pins or clips. Foam rollers create soft, bouncy curls and are comfortable to sleep in.

4. Flexi Rods: Flexi rods are flexible, rod-shaped rollers made of foam or plastic. They can be bent into various shapes and sizes to create different types of curls. Flexi rods are versatile and can be used on wet or dry hair.

5. Curling Wands: Curling wands are cylindrical in shape and do not have a clamp like traditional curling irons. Hair is wrapped around the wand and held in place until the desired curl is achieved. Curling wands are versatile and can create a range of curl sizes and styles.

6. Curlformers: Curlformers are long, spiral-shaped tubes that come in sets with a hook for threading hair through. They create uniform curls without the need for heat and are suitable for all hair types.

7. Steam Rollers: These rollers use steam to set the hair, resulting in longer-lasting curls with less damage compared to traditional hot rollers. Steam rollers are often used in professional settings but can also be found for home use.