DAMO 4” wet pads have two different types, which are Regular and Ultra Thick.
The 4” Wet Polishing Pads in Regular are the conventional and most popular pads. If you want to polish very abrasive materials, or want the pads to be longer lasting, we recommend you to use the Ultra Thick pads in order to ensure the longer lasting life. Especially with the lower grit pads, they tend to be used up much quicker than the higher grit pads. Ultra Thick pads are super long-lasting and last up to 2X in polishing jobs versus Regular pads.