I ordered the 28mm watch lens protectors. The lens protector must be installed using the wet proceedure or it will not be clear. When done using the wet proceedure, the protector is easily applied in position without any bubbles and dries absolutely crystal clear. I have several Citizen watches that have mineral crystals that scratch easily. When I applied this product, I cannot see or tell that it is on the watch. It looks perfect! If I do get a scratch on the protector down the road, it will be easy to to just put a new protector on and the watch will be like new again. This is much cheaper than replacing crystals at $50.00 a piece....Great product!