SUPER MATERIAL: It is made of electronic accessories, nickel plating on surface(anti-oxidation), inner conductor: pure copper. It is long lasting and durable for you to use. PACKAGE INCLUDING: 2 pack of grain elimination module. It can effectively eliminate the mechanical chatter generated by 3D printer motors, especially for parallel arm configurations of the machine effect is significant. Lower vibration lower noise smoother result. Applicability: you will get smoother movement especially on the delta-style 3D printer under DVR8825 stepper drivers or A4988 / 2 drivers. I3 and UM models can also be used, and different machines will have different clipping effects.