Get an professional finish with top-of-the-line sanding blocks from Dura-Block. Great for wet or dry sanding, the blocks are made from patented closed-cell EVA rubber. They are sized and shaped to create flawlessly flat surfaces and/or detailed contours without ripples or gouging. The AF4421: -11?L, Thickness: 1-1/4? -Versatile, flexible and conformable round (tubular) sanding block -This allows the reuse of sandpaper and saves money and time.