Description:

Blue Velcro abrasive Discs made of high-quality alumina oxide and velcro backing. The abrasive papers can be used for wet and dry sanding. Electro coated ensures the grit distributed uniformly. Prevent clogging, anti-static, good flexibility, wear-resisting, that provides outstanding life and superior finishes.

It’s more effective used wet because clogging is reduced by particles washing away from the grinding surface.
It can be used for mold surface precise sanding, and also in stone, lacquer surface, mirror surface treatment such as headlamps polishing. Waterproof sanding discs can be used for dry sanding too, it’s harder than white dry sandpaper.
Wood Furniture finishing, drywall sanding, automotive metal polishing, almost all the polish work can be finished with them. Just choosing the right sandpaper grit for your project.
Grit refers to the average particle diameter. The smaller the grit number is, the coarser it is. The larger the grit number is, the finer it is. According to the grit range: 60~1200 grit, the coarseness of the 600 grit is about MEDIUM.

There are also other economic alumina oxide sanding papers  for options

Application：applicable to furniture, automobiles, metal and non-metal, wood, rubber, leather, plastic, stone, glass, complex surface rust, paint, deburring, solder joints grinding