SIR is a family owned business that has been manufacturing tip cleaning sponges for over 30 years. They use only the finest quality American made natural cellulose sponge material available for the electronics industry. Cellulose sponges have long been used by the electronics manufacturing market as an accessory to clean the tip of a soldering iron. Our world class distributors provide valuable products and services to meet your every need. All sponges are shipped compressed unless otherwise noted.