The top one Tube Socket of Teflon is take the unique design idea of tube. The insulator is use the top material of Teflon that is expensive and hard to obtain (It can be used under -180℃ ~ +260℃ temperature without load, and it has the lowest friction coefficients in known solid materials.). The design of Three-dimensional can increase the area of contact. To strengthen the contact and raise the life of tube, good conductivity of tube makes perfect timbre.