Material - this ukulele bridge saddle is made of premium ebony,which is durable than other synthetic materials made parts. Designed compatible with 4 string ukulele - this bone bass nut is suitable compatible with your 4 string bass ukulele,which can help sustain tone and improve the sound quality. Won't damage your strings - the 4 slots with sleek and smooth compatible with surface,not damage your strings. Function - the ukulele bass can improve the overall level of the bass and play a role in improving the acoustic quality of the bass.you will enjoy music during percompatible withming. Perfect gift - good quality and portable instrument replacement is a good gift compatible with music lovers. Specification: Size_Chart: Neck Nut(up-saddle):35 x 5 x 7.2 mm/2.09x0.12x0.28inch Bridge Saddle(sub-saddle):53 x 3 x7 mm/1.38x0.2x0.28inch Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you! Package_Includes: 1 Piece Nut 1 Piece Saddle