Dust-Aid DUST-CLOTH MF Micro Fiber DSLR Camera Sensor Wipes are made from a very soft weave of micro fiber cloth that has been tested repeatedly not to scratch sensor filters or their coatings. Dust Cloth micro fiber wipes are designed not to produce loose fibers because the sides of the wipes are heat sealed so fibers can't break free, and the 3" x 3" size ensures that you are only using the center part of the wipe, and the sealed edge will not come close to the sensor filter when they are wrapped properly around a Dust-Aid Wand.