Atoplee 10x Universal Soldering Solder Iron Tip Cleaner Welding Replacement Sponges Pads Size: (L)3.5cm*(W)4.5cm Anti scald and resistance to high temperature,Once immersed in the water, it will expand, without sulfur. It can almost wipe solder iron head off completely. Large expansion coefficient.It is used for wiping the solder leftover on the soldering iron head. It can prevent the welding head from oxidation and burned by overheat, remove the solder residue and keep the PCB board clean.