Overview: This sponge wheel is special for polishing the surface of all kinds of cars It can be worked very well below 1800rpm at empty, ether on pneumatic or electric polisher The sponge wheel must be wet at work, when it is used at first time, you must put it into the clean water, then let water get out of the product & then mount it on the polisher, turn on the polisher let the more water get out from sponge