The CLP121 is a female XLR to male 6.3mm jack mono adaptor for connecting cables that lack the right connection for your audio device. The firm molding over the connector ensures an isolation from the ground and gives a solid feel.
The connectors that are fitted with gold plated contacts have the advantage of preventing oxidation and maintain performance after years of use. Another great property of gold is that it is an excellent electrical conductor. For comparison, if pure copper has a relative conductivity of 100 then gold is only 31% lower than copper, while nickel is 76% lower than copper.