Changing lenses on your camera when you are in the field can cause dust and debris to land on your sensor when it is exposed. The 12-pack of Type 2 Sensor Swab Ultra from Photographic Solutions features 17mm wide swabs for DX or APS-C sensors. They're designed to clean oil, dust, and debris.
The thick and double wrapped swab is highly absorbent, and each swab is individually packaged to maintain the purity of the swab for cleaning. The fibers of the swabs do not shed once the sensor has been swiped across.