Usage Tips:1The bridge saddle and nut are made of bone, much harder and allowing better tone quality. 2The saddle can be cut easily using a junior hacksaw and filed to the correct length for your guitar. 3Files set are made of stainless steel material, sturdy and durable, also anti-rust. 4The files set is equipped with 13 round files for polishing the string slots and making slots smooth, and 1 flat file for burnishing the nut and bridge. 5The sand paper can be used to polish the fret board, fret, sides and strings, etc, which enable you to adjust the high of saddle and nut anytime.color:#006600;Features: The bridge saddle and nut are made of bone, much harder and allowing better tone quality. The saddle can be cut easily using a junior hacksaw and filed to the correct length for yourguitar. Files set are made of stainless steel material, sturdy and durable, also anti-rust. The files set is equipped with 13 round files for polishing the string slots and making slotssmooth, and 1 flat file for burnishing the nut and bridge. The sand paper can be used to polish the fret board, fret, sides and strings, etc, which enableyou to adjust the high of saddle and nut anytime. Four terms coming in combo, very useful and practical for guitarists. color:#006600;Specification: Condition: and Files Material: Stainless Steel Saddle and Nut Material: Cattle Bone Color: Shown as pictures Nut Size: Approx. 43x6x9mm/1.69x0.23x0.35inch Saddle Size: Approx. 72x3x9mm/2.83x0.11x0.35inch 13 Round Files Diameter: Approx. 0.4-1.6mm/0.014-0.061inch Sand Paper Size: Approx. 9x7cm/3.54x2.75inch Files Quantity: 13 Round Files 1 Flat File Sand Paper Quantity: 9Pcs(3 Pcs 320 grit, 6 Pcs 240 grit) Weight: Approx. 40gcolor:#006600;Packing List: 1 x Guitar Nut 1 x Guitar Saddle 1 x Files Set 9 x Sand Paper(3Pcs 320 grit, 6 Pcs 240 grit)