Promotional 15cm x 10cm x 5cm Optical Crystal Rectangle with Onyx Black Base Simple and stylish this Optical Crystal Rectangle is perfect as an award or a special gift. It has a classy black Onyx Base and is ideal to customise using techniques such as 2D or 3D sub-surface engraving sandblast engraving and colour printing fantastic results are achieved. The rectangle is crafted from perfectly clear optical crysal achieving outstanding clarity and is available in four sizes. The quality of this item is indisputable from the thickness and the weight. It is supplied in a black foam-lined presentation box.