Sieper GmbH is a medium-sized company with headquarters in Lüdenscheid, and founded in 1921. The company employs 650 staff worldwide at various locations. Sieper GmbH produces mechanical and remote-controlled toy models in various scales under the siku brand name. Siku toy models are accurately detailed, robust, and provided with a multiplicity of play functions. Development, design, marketing, administration, and production are located at the company headquarters in Lüdenscheid.
In addition, the Sieper group has further production locations in Poland and China, as well as its own marketing subsidiaries in France and Hong Kong. Siku toy models are marketed worldwide. The major export countries include European states such as France, the Benelux countries, and Scandinavia. However, siku is also an established name in the toy market in overseas countries such as China, Japan, Korea, New Zealand, and Mexico.