Kent’s handmade combs are saw cut, and then hand polished and buffed to create soft rounded teeth that will not damage your hair or scalp. They are made from cellulose acetate, a non-petroleum based plastic derived from plants that has been found to create less static in hair. These teeth run smoothly through your moustache each and every time.
A non-handmade comb is known as an injection moulded comb. These sorts of combs have razor sharp teeth which damage the hair cuticle, and scrape the skin. They also feature tiny ridges, known as ‘mould marks’ which scratch and snag your moustache. After buying a ton of brushes and testing them--these are the best I've ever used. Here is blog post about these combs.