This RCA cord is made of special material which can stand to bend or stretch many times. The conductor is pure copper and the conductive performance is stable all the time. Comparing with soldered connector, these connectors are more steady during tattooing. Sustaining 30kg- pullout force and over 30000 times bending test. Filler improvement lies on the added nylon mesh and cotton yarns, which increase its tension and bending strength.