Rubner Superior Series Tuning Machines- Solid Brass with Rubner Roll End Bearings Superior Series with rubner Roll End Bearings &. Moldflon Anti-Friction Bearings Ebony Special Buttons with new large button decoration Ivory Rubner Roll rollers, 15:1 Turning Ratio / 35-70 Roller Spacing Solid Brass - Set Weight 5.8 OZ 1 set (left and right), with matching screws