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 AF4420: -Conforms to work surface -Follows curves or flat surfaces -Used worldwide, wherever professional body work is done -This block is designed to follow slightly curved or flat panels without digging into the fill material -Hook and Loop attachment for Hook and Loop type paper allows paper to be removed and reused, saving time, money and paper; 3/4" height x 1.375" width x 11" length