National Nonwovens Wool Felt is 20% wool/ 80% rayon blend. All natural wool and rayon fiber blends have rich textures and outstanding uniformity. Works well for penny rugs, quilts, purses, bags, backpacks, accents on clothing, hats, and much more. Approximately .06" or 2mm thick. 12"x 18" Distant Thunder- 12"x 18" sheet.