Superior precision machined stainless steel saddles with brass rollers; will increase the sustain and tuning stability No rough edges or burrs; Roller saddles can make intonation adjustment more precise and easier, reduce string breakage as well These saddles require very little work and skill to install, it's an easy way to improve your tone and sustain; 3 narrow slot roller saddles are for treble strings and 3 wide slot roller saddles are for bass strings Dimension: 20mm length * 10.5mm width / 10.8mm width * 5.5mm height; 10.50mm width for string width from E to e 52.5mm (2-1/16"); 10.80mm width for string width from E to e 54mm (2-1/8"); Please measure your old saddle's height and distances when you order these saddles Comes in a set of 6 pieces for many electric guitars