1. This RCA cord is made of special material, which can stand to bend or stretch as many times as it can. Until now two types - soft or hard 2. The conductor is pure copper, and conductive performance is stable all the time. 3.Comparing with soldered connector with heat-shrinkable tubes, our connectors are completely casting, and more steady during tattooing 4.Sustain 30kg- pullout force and over 30000 times'bending test 5.Filler improvement lies on the added nylon mesh and cotton yarns, which increase its tensile and bending strength.