Urocare - Tracho-Foam Discs are designed to secure tracheostomy valve housings to the skin using a double-sided adhesive. This adhesive resists perspiration and provides an air-tight seal, eliminating any hissing sounds. These trach wafers are made from a hypoallergenic ensolite foam that conforms to contours of the neck. Simply remove the peel-off backing and secure to the trach flange. This product is latex free and is available in two sizes.