Three-inch magnetic rollers deliver volume and body to long, straight hair. This photo of Elizabeth Hurley is from www.shampooandset.com.
Magnetic rollers are called magnetic because wet hair clings to the plastic. So as you roll, if the hair starts to dry, then use water to re-wet it in order for it to cling.
The magnetic rollers range in sizes up to about 3 inches.
Rollers this size should be double clipped. Notice the clips? Roller pins as seen in the picture below can also be used. Roller pins are extra long bobby pins.
This picture of the back of a roller set client is from www.shampooandset.com It gives you an ideal of roller placement and the use of a net to hold the rollers in place. Also, look closer at the anchoring of the rollers. Can you see that two roller pins are used to hold the rollers in place? More than likely, the hair on the rollers are rolled as a flip set in order to keep the roots flat. Please see my separate article on flip roller sets.
My salon has a large inventory of 3-inch rollers for long hair services.