SIR is a family owned business and have been manufacturing tip cleaning sponges for over 25 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. All sponges are shipped compressed unless otherwise noted. Our world class suppliers provide valuable products and services to meet your every need.