There are three general kinds: curling, used to make it curly, straightening, commonly called straighteners, used to straighten it, and crimping, used to create crimps of the desired size. Most models have electric heating; cordless curling ones typically use butane. Curling ones, also known as curling tongs, create waves or curls. There are many different types of modern curling ones, which can vary by diameter, material, and shape of barrel and the type of handle. The barrel's diameter can be anywhere from .5 inches to 2 inches. Smaller barrels typically create spiral curls or ringlets, and larger barrels are used to give shape e of Teflon, ceramic, tourmaline, metal, or titanium, each of which has its pros and cons.
Curling ones are typically mad barrel's shape can either be a cylinder, cone, or reverse cone, and it can have brush attachments or double and triple barrels. The curling one can also have either a spring-loaded, Marcel, or clipless handle. Spring-loaded handles are the most popular and use a spring to work the barrel's clamp. When using a Marcel handle, named after Marcel Grateau, one applies his or her own pressure to the clamp. Clipless wands have no clamp, and the user simply wraps it around a rod. Most clipless curling irons come with a Kevlar glove to avoid burns.
Straightening ones, straighteners, or flat, not to be confused with clothingones, work by breaking down the hydrogen bonds found in the cortex, which cause it to bend and become curly. Once the bonds are broken, it is prevented from holding its original, natural form, though the hydrogen bonds can re-form if exposed to moisture. They can also use infrared technology. Crimping ones or crimpers work by crimping in sawtooth style. The look is similar to the crimps left after taking out small braids.