Ternes-Burton register pins combine a stainless steel base (.013" thick) with a precision machined stainless steel button.  The buttons have multiple welds for strength.  Both the tops of the buttons and the bottoms of the bases are hand polished to prevent scratching your work.  Having the buttons centered helps prevent tilt, and the hole in the base provides more taping area, helping preventing movement.  Packaged in bags of 10.