This sample bag of the F15 Industrial Felt gives you a 3 inch x 3 inch square each of 1/2 inch, 1/4inch, and 1/8inch thickness. SAE F-15 Felt is made of minimum 55% gray wool and has a density of 0.17-0.20 g/cm3. It is recommended for sound deadening, chassis strips, spacers, dust shields, pedal pads, dash liners, and mechanical purposes where abrasion and wear are not important factors. This 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.