This soldering Wick 3.5mm in size is an equipment that is used in disordering of already soldered joints. This is made out of pure copper in that if you what to un solder the joints in electronics you place the soldering iron while its hot on the soldering joint and then the soldering wire melts you hold the soldering Wick and place it on the melting soldering wire this Wick will attract the soldering wire hence leaving the joint.