Package Content & Size - 30pcs soldering iron cleaning sponge ( 15pcs yellow + 15pcs blue). Length: 60mm/2.36inch, Width: 40mm/1.57inch, Height: 11mm/0.43inch Features -The water-permeable sponge is soft, does not damage tools, and is cleaner than iron balls. The middle hole is designed so that the middle hole can easily scrape the solder from the tip Material - This is a special heat sponge, soft and tough. It benefits from the rough and porous design, instantly expand several times after water absorption, has a good cleaning effect Usage - Soak the high-temperature sponge in water, squeeze out the excess water after expansion, and rub it several times with a hot electric soldering iron tip to completely remove the oxide layer and welding slag on the soldering iron tip Advantage - The cleaning sponge does not evaporate water for a long time and then becomes dry, and can be reused after re-soaking, Manufacturer: Akfldms