Seamless Green China (Holdings) Limited, formerly Fast Systems Technology (Holdings) Limited, along with its subsidiaries, is engaged in the manufacturing and sale of synthetic sapphire watch crystals and optoelectronic products. The Company operates in two segments. The synthetic sapphire watch crystals segment is a supplier of watch crystals mainly for use in the manufacture of watch products. The optoelectronic products segment is a supplier of optoelectronic products for use in Internet cable. Some of its wholly owned subsidiaries include Oriental Light (Holdings) Limited, Oriental Light Industries Limited, Oriental Light (Fuqing) Company Limited, Fast Systems Limited, Orient Rise International Limited, Principle Industries Limited, Superjet Technologies Limited and Fujian Superjet Technologies Company Limited.