I noticed a young couple was in my store for more than 20 minutes. They were looking and checking on the combs. I went forward to offer some assistance.
Woman: Aiyo, this one also has a hole.
Man: All these also.
Me: Excuse me. Can I help?
Couple: The combs here have defect, see there is a hole in every comb.
Me: These combs are cushion brush, the hole is meant to allow air flow.
Woman: You sure not, I think these are old brushes, and the bristles have dropped.
Me: Then the defects are rather consistent. All combs have their hole at the same place. If there is no hole, then it becomes hard cushion.
Not sure if the couple later decided to get the comb, I gave up on them. They really have no common sense.