Promotional 15.5cm Optical Crystal Rectangle with Onyx Black Base The 15.5cm Optical Crystal Rectangle is hand crafted out of perfectly clear optical crystal and onyx black crystal to create this stylish and very popular award. It benefits from a large engraving area that can be personalised with 2D or 3D engraving, sandblast engraving or full colour printing with any crest, logo or wording to create an award that is sure to take pride of place when put on display at home or at work. It is supplied in a black foam lined presentation box.