The original Opti-Wipe from OptiMA® are the best dry erase board cleaning cloths that you will ever use. Opti-Wipe 16" x 16" microfiber, all-purpose dry erase cleaning cloths are available in five colors: Green, Pink, Blue, Yellow and Black. These dry erase cleaning cloths will clean your board better than ever before. Made from a blend of 70% Polyester and 30% Polyamide (Nylon) plastic resin fabrics. Opti-Wipe microfiber cleaning cloths help to significantly reduce the amount of dry erase dust generated from normal cleaning methods. Our new wipes will clean your whiteboards to brilliant shine. Each cloth is 16" x 16" and they are fully washable for continued use. Opti-Wipe microfiber dry erase cleaning cloths will out-last and out-clean conventional felt erasers. Felt erasers just don't work with dry erase boards because they were designed for chalk. When you use a traditional felt eraser on a dry erase board the dust from the marker simply builds up on the felt and you can't get it out. Over time you actually end up cleaning your boards more and more only to smear them again with the buildup that remains on the felt eraser.