Titanium is a premium lightweight metal with hypoallergenic properties.
Titanium makes the McHardy lighter as well as making it available to horses that have a sensitivity to metal. 
A horse shaking its head when bit pressure is applied or trying to put its tongue over the bit are classic signs the horse has a sensitive tongue. With this in mind the McHardy was created, it has a medium port creating space for the tongue, relieving pressure. The roller in the middle increases bar pressure and as a result extends the head and brings the nose in giving more control.