Materia Tinned Red Copper Tinned Red Copper Tinned Red Copper Tinned Red Copper Tinned Red Copper Tinned Red Copper Tinned Red Copper. Live Without Limits:Don’t be held back by a humble looking wire connectors.Haisstronica heat shrink connectors are made of tinned copper.The tinning process is designed to effectively prevent copper from being oxidized and reduce resistance.While higher purity copper enhances electrical conductivity. Leia Mais