The AF4406 is a perfect addition to the Dura-Block family. The new Dura-Block is called "Tear Drop" This new tear drop block will fill a demand from our current and future users of the Dura-Block line. This block is designed for larger curved panels to allow perfect smooth radius finishes and also allows for better grip on the block due to enhanced shape and size. Designed to fit a standard 9" X 11" wet or dry sheet of sandpaper. The block size allows a perfect fit for 100% use of a standard 9x11 sheet without cutting, or tearing. Price reflects per piece.