This sample bag of the F51 Industrial Felt gives you a 3 inch x 3 inch square of 1/16 inch and 3/32 inch thickness. SAE F-51 Felt is made of 92% gray wool and has a density of 0.32-0.36 g/cm3. F-51 is recommended for ball and roller bearings, oil retainer washers and smaller dust excluding washers. Common uses include thin cut parts such as gaskets and liners or applications where felt of slightly lower quality is acceptable. This sample bag is a perfect way to match and select your grade of felt and be able to physically feel the felt. These can be kept in your swatch library to refer back to or for applications that need a smaller amount of industrial felt to work with.