The Eyelead sensor and lens cleaning kit SCK-1B has an adhesive rubber head with a high viscuosity which will allow you to effectively remove dust from the sensor of your camera. Using the Eyelead dust-sticking brush is a very efficient and secure way to clean the sensor or lenses. It doesn't leave any traces or marks at all. You can easily do it yourself and will not have to invest in expensive cleaning services. For Sony A7 II, A7R II and A7S II, Since the cameras have in-body stabilization, If it's the first time sensor cleaning, we highly recommend to do a cleaning by using high quality wet cleaning solution, instead of the sensor cleaning gel stick. If in case you see smears after cleaning, please clean the sensor asap using the high quality wet solution..