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 AF4431: - Designed for sanding and prep work -For use with PSA sandpaper -Great for wet or dry sanding -Size: 5/8"H X 2-3/4"W X 5-3/8"L