Promotional 18cm Optical Crystal Arch Award with Onyx Black Swooping Base The Optical Crystal Arch Award looks exceptional and really stands out with its Onyx Black Swooping Base and vivid curved shape. Made from authentic optical crystal it really gives meaning to the famous phrase inchinchcrystal clear.inchinch Available in three sizes 15.5cm. 18cm and 20.5cm there is generous space to personalise the award with any crest logo or wording using techniques such as colour printing sandblast engraving or 2D and 3D subsurface engraving. They are ideal recognition achievement or incentive gifts and are supplied in a beatiful presentation box.