The most obvious feature of the Oi bell is its shape. Where most analogue bells are domed, the Oi is a cylindrical shape, perfectly wrapping itself around the handle bar. In fact the CNC-machined metallic metal ringer almost levitates off the bar, held by small springs attached to the mount. This results in a low profile, both vertically and horizontally for the rider. As there are more and more pieces of equipment demanded on the handle bar by cyclists, the Oi is a beautiful addition, without taking up valuable space.