Enerkon Solar International Inc., formerly Castle Holding Corp., is a holding company. The Company's subsidiaries include Castle Royalties Corp., SAS Health and Beauty Corp. (SAS), The Unlisted Stock Market Corporation and Shark Venture Capital Inc. SAS is engaged in manufacturing and marketing of a skin care product called SAS Flower of Youth Facial Lift Spray. Through its subsidiary SAS, the Company focuses on pursuing the manufacturing and marketing of the licensed products. The products relate to a line of stem cell nutrition and anti-aging ones, which are used by the sectors in nutritional supplementation. Shark Venture Capital Inc. focuses on engaging in venture capital activities. The Company and its subsidiaries have had minimal business operations and operating revenues.