Feature: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.Pair of Roller Guitar String Trees4.Two little rollers on each tree.5.The rollers lessen the stress on your strings which allows the guitar to stay in tune longer. 6.This also prevents wear and tear on the strings which results in longer string life. Base is 6mm wide x 11.5mm Total height including roller is 12mm Roller width is 10mm Roller diameter is 5mm String Spread(center to center) is 7mmColor:Chrome Weight:50gPackage Included:5 Set x Guitar String Trees(10pcs)