Connex
Founded in Germany, CONNEX by Wipperman company has been manufacturing various types of bicycle chains for more than 120 years. The product range is for both single gear and top-of-the-line 10/11 gear systems. All models are made only of extremely high quality steel. Each new model of Connex chain is thoroughly tested in the laboratory to meet all quality standards. Higher-class models are coated with special materials that provide greater resistance to external environmental factors - water, dirt, etc. All Connex chains are easily and quickly connected with a special connector - no additional tools are required.
More information about Connex chains: https://www.connexchain.com/en.html
https://www.youtube.com/watch?v=RGjcD8xEu8o
https://www.youtube.com/watch?v=7kWxnLBmNPs
Connex chain catalogue: https://www.bikko.lt/connex-dviraciu-grandines