This case keeps your Invisalign aligners and retainers secure at home and on the road. A magnetic closure ensures the case is securely fastened. The textured liner helps to minimize slipping and moving inside. Spacing behind the hinge allows for ventilation. Case dimensions 3 ¾” diameter x ¾” high. Usage: For use with standard Invisalign aligners and Vivera retainers. Patients who have Invisalign aligners with precision wings should not use this case, as it may damage the aligner’s precision wings. Store aligners and retainers in the case when not in use to minimize damage and loss. This case is not designed to immerse aligners in water for cleaning. Ingredients: Medical grade plastic. Not made with natural rubber latex.