Coltene - Hygenic U-shaped Bite Wafers with Foil Insert - Light Blue, Box of 24Produces detailed registrations Aluminum stops patients from biting through the material Does not deform Laminated with foil Hygenic Bite Wafers are U shaped wax materials that offer accuracy and improved retention. These bite masks include a thin aluminum foil in their two layers while getting rid of bite throughs. Light Blue Bite Wafers have a regular thickness and minimize distortions.