Each mirror has a protective film coating or equivalent on both sides. Mirrors are reflective on both sides. Pack includes 165 mixed mirrors: 20 @ 15 x 10 cm 30 @ 9 x 6.5 cm 5 @ 30 x 20 cm 10 @ 10 x 10 cm (concave/convex) 100 @ 7.5 x 2.5 cm Each mirror is 0.1 cm thick. Suitable for ages: 3+