Why have you discontinued the Ball Tip Brush Rollers for women's hair curlers?

I have used the Ball Tip Brush Rollers for a long time, but they are no longer available at the stores. They consist of a wire roller encased in a nylon webbing and it has a brush inserted in the middle. I do not use the brush (I take it out) and I use the wire roller with the nylon webbing to curl my hair.

I have had many other women ask me where they could buy the wire rollers with the nylon webbing so they can curl their hair, but they cannot find the product in the stores any longer. They do not like the foam rollers nor the plastic rollers, because the foam squashes when they use it, and the plastic rollers are too hard when you sleep in them.