Rubystick.com is the worlds original source, since 2007, for these high end, top quality cleaning swabs. We were the first and will always be the worlds leader for the Rubystick swabs, so don't be fooled by wannabe's. Rubystick's are the leading technology for cleaning todays high end printers and specialty tech equipment. The swabs have a very soft polyurethane head to leave no lint behind with an angled tip to reach the smallest of places. The head is made of super porous fiber allowing extreme absorption of both cleaning fluid and/or liquid debris being removed. Ideal for cleaning LCD screens, jewelry, laboratories, printers, weapons, computers, micro-chips, antiques, and just about any equipment that has hard to reach places in need of cleaning without leaving any unwanted strands of cotton left behind. These tips offers good heat resistance and strong corrosion resistance against chemicals and extreme situations. We offer multiple sizes to accommodate whatever application you are challenged with. If you do not see what you are looking for in our online store please send an email in the contact us page so we may help you any way we can. The T-11 is most commonly used for Jewelry, clocks and computer parts. The T-21 is standard for cleaning many of the wide format printers on the market today (such as Brother, Mimaki, Pitney Bowes, HP, Epson, among others) We've directly worked with these manufacturers in the testing process to become the recommended swab by them under warranty of the equipment. The foam tip replacement assists in minimizing operation costs for equipment that requires daily or frequent cleanings.