There are 200 pieces in the bag, 5.1" (128mm). <br><br>foam swab head is made from the highest quality open-cell foam securely bonded to a polystyrene shaft. <br><br>swabs are perfect toClean printer heads, keyboards, and tight to reach places,great use for piezoelectric photo machine print nozzles,water-based and most solvent printhead. <br><br>Swabs are also great to use around the house such as A/C vents and vents around your kitchen range <br><br>Foam Cleanings Swabs are made specifically for cleaning sensitive equipment such as printers, microscopes, optical sensors and safe for solvent print heads.