Heavy duty  unit quality metals which include brass and nickle plated stainless steel.
Unfortunately no diagrams or narrative instructions were supplied with the install, which would be an issue for the end user or home installer.  The unit did include a top cover to allower conversion from the older 3 hole sink to the newer single whole style mount.  Similar to the bathroom faucet the replacement of hoses in the future appears to require a full deinstallation of the unit versus  replacement undereath the unit.