Soldering Iron Stand Replacement Sponge is designed to fit into a standard soldering iron stand tray. Wet the sponge and place it in the iron stand tray to periodically wipe and clean the soldering iron tip during the soldering process.  The natural cellulose sponge won't burn or foul tips. Clean your sponge with clear running water prior to use, replace the sponges when worn and never use dry. Keep damp while in use. Sold in a package of 2 sponges.