The Mastery String Tree is machined (not formed) and features Mastery's unique hard chrome plating so the strings glide smoothly without the use of moving parts. It has a little more break angle to prevent sympathetic overtones caused by low string tension and less surface area touching the string verses the 50s wing design. Comes with a custom stainless steel screw that's a bit longer as well as our custom made stainless steel spacer.