NIC Barber Written (Theory) ExamHair Care ServicesMedium
A client has very coarse, resistant hair and desires a permanent wave with a strong, firm curl. Which type of perm rod would be most effective in achieving the desired curl pattern?
- ASoft bender rod
- BStraight rod
- CLarge diameter rod
- DConcave rod
Show answer & explanationAnswer & explanation
Correct answer: D. Concave rod
Concave rods produce a tighter curl in the center and looser curls on the ends, which is ideal for creating a strong, firm curl, especially on coarse, resistant hair where a tighter wrap is beneficial for better saturation and processing.
Why the other options are wrong
- A. Soft bender rods are flexible and create soft, irregular curls or waves, not a strong, firm curl.
- B. Straight rods produce a uniform curl from scalp to ends, which can be firm but may not provide the desired tightness for coarse, resistant hair compared to concave rods.
- C. Large diameter rods create larger, looser curls or waves, not a strong, firm curl.
Concave Perm Rods
Perm rods that are smaller in diameter in the center and larger on the ends, creating a tighter, firmer curl in the middle of the hair strand and a looser curl at the ends. They are effective for producing strong, consistent curl patterns.
- Most commonly used type of perm rod.
- Ideal for achieving tighter curls and body.
- Suitable for various hair lengths, especially medium to long.
Memory trick: Concave creates core curls.