Visible Dust Full Size Pro 1.0x Sensor Brush Cleaning Kit (2 Sensor Brushes) This kit is recommended for the following cameras: Canon 1Ds, 1Ds Mark II, EOS 5D, Kodak DCS SLR/c, DSC SLR/n, & DCS 14n Contax N Digital Friction Resistant - using the proper technique during processing one can change the friction resistance of the brush fibers. Therefore determining how much residue is left on the sensor by various polymers. Neither of these processes will change the appearance of the brush. Curing - Is done to prevent the residual stain left behind with most polymers. This is achieved using high-temperature baking and/or chemical and radiation techniques. Fiber Thickness - Sensor Brush is made of the thinnest possible fibers. They are quite resilient in texture and several times thinner than a human hair and are 30-40% thinner than most consumer fibers. Flow thru - Sensor Brush is designed to have the optimal fiber density concentration allowing the dust crystals to pass through without resistance.