Please Call Us or send us an email through Your Order on Amazon, we are here to help you with any questionsEvery sensor cleaning swab is made in a 100% dust-free environment and sealed in a vacuum packageSuper soft and flexible swab head spreads pressure evenly across the sensor and cause NO damageThe sensor cleaner is made from ultrapure water, clean sensors without leaving streaks or blemishesPackage includes 12pcs 16mm cleaning swabs for APS-C Sensors AND 15ml Sensor Cleaner