These Austrian Lead Glass Crystals contain 30% lead oxide which produces the highest quality of refracted light, forming spectrums of purest color. They can be used for light meditations, for inspiration and for decoration. The faceted Crystal Balls are the traditional styles, available in clear and also in beautiful crystal colors, such as Siam (a deep yet translucent red, only available in 20mm). These will work beautifully to catch the daily sun coming in through your shop window! 30% lead oxide; with hole for hanging.