HJ R6 Wide Tail Comb. MADE FROM: Ebonite (hard rubber + synthetic rubber). This compound increases the durability and strength. Combs made from 100% hard rubber tend to be fragile and can break when dropped a few times, whereas Head Jog R combs are much more robust. HOW ARE THEY MADE: The compound is placed into the mould and compressed for a fixed period of time. Then it is vulcanized (heat & steam). The profiles of the comb are ready and the teeth are cut. Each tooth is cut individually by hand. After the cutting operation the teeth are polished so that they are rounded. Head Jog R combs have smooth rounded teeth which massage the scalp & keeps the hair cuticle smooth making hair strong & healthy. (Ordinary combs have razor sharp teeth. Also the rough edges between the teeth act as razors, damaging the hair cuticle making the scales rough & can therefore cause unhealthy hair with split ends).