100% Wool 3mm thick Felt 20 colors of top quality, dense, heavy, 3mm (1/8 inch) thick 100% merino wool felt. Sold by individual colors, choose from 9"x9", 18"x18" squares, or by the yard. Top quality, dense, heavy, 3mm (1/8 inch) thick 100% merino wool felt. weight: about 1.6 pounds per square yard. free of any harmful or toxic chemicals. Dyes are OKEO TEK certified.