The male square pins are phosphor bronze with a 30.0 µ" (0.76 µm) gold or Gold, GXT™ finish on the mating surface, rated for 5 A per circuit at 110 V.
The 0.100" pitch is the de facto standard for 0.025" square post headers — your PCB footprint matches any industry-standard 0.100" x 0.100" grid receptacle.
Compliance and approvals
The contact finish — gold or Gold, GXT™ — is a RoHS-compliant option from the manufacturer, though the specific RoHS certificate should be confirmed at order for your jurisdiction.