The qualities of natural horn are difficult to define. They simply 'feel' much nicer than their plastic counterparts. They are hypoallergenic, which means that if you've ever had a problem with frame allergies, which is fairly common with metal frames, then these are not going to cause you any problems.

They're also very light, very strong and ultra-comfortable. They range in price from £350 to over £1000.00, for completely custom-made versions.