This highly polished Premium Quality Single Sided Glass surface will not chip, crack or peel. The mirror has polished, rounded edges for patient comfort. Dimensions: Lingual 6 cm x 15.5cm (at widest point), Adult Occlusal 7.5 cm x 10.5 cm, Child Occlusal 6 cm x 7.5 cm,Adult XL 7 cm X 13.5 cm,Buccal 4.5 cm X 14.5 cm