Copper pins impossible to be broken, not only look beautiful, also not easy to be oxidizedMaterial: copper + ABSSize: guitar pins: length 30mm, bayonet maximum diameter 5.3mm, pins puller: length 57mm, width 18mmCopper is harder , it can increased brightness and even added bass, This is because the hardness of the material transfers the vibration of to the top of the guitar with more efficiency. and the brass at the pin will definitely increase the loudness and dynamics, it may actually increase the high frequency content of your guitar, let the tone more attractive. Package Include: 6 pcs Copper guitar pins1 x pins pullerNote: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.