Natural lambs wool by Capezio Bunheads. The lamb's wool is treated with SmartSilver™ which is a natural antimicrobial that guards against odor. When it comes in contact with moisture, it releases low levels of silver ions that prevent the growth of microbeads that cause odor and material degradation. It features a 1 oz. tub non-toxic and hypoallergenic. 100% wool.