Which type of rods are used to produce small firm curls?

The choice of small diameter rods is the correct one for producing small firm curls. This is because the diameter of the rod directly influences the size and tightness of the curl formed. When small diameter rods are used, the hair is wrapped tightly around the rod, allowing for a more compact curl that holds its shape. This tight wrapping creates a firm curl due to the concentrated curl pattern, which enhances the overall volume and texture of the hairstyle.

In contrast, large diameter rods produce looser and larger curls, which may not satisfy the need for tighter curl definition. Medium diameter rods create curls that are neither too tight nor too loose, making them suitable for a range of styles, but they do not achieve the small, firm curls that small diameter rods accomplish. Flexi rods, while versatile, are often used for different styling effects and may not provide the same level of firmness as traditional small diameter rods when aiming specifically for small, tight curls.