Made of high-temp Nylon and gold-plated spring connectors, both included in the injection mould at the time when forming the connector.
The XT60 ensures a solid high-amp connection, perfect for applications up to and beyond 65A constant.
Please see my other listings for 9-12-15-20V PD output to XT30/XT60 adapters :
https://www.ebay.co.uk/itm/275155371999 https://www.ebay.co.uk/itm/275165644646 https://www.ebay.co.uk/itm/275036519627