Material: PC, PET, TPU Film size: L250 x H195 x T0.25 (mm) Weight: 30g + (-) 5 Pet film has 2-sided scratch-resistant stickers -USES Suitable for all ages, quick glasses for children, adults.. Can be used many times The glass does not steam when breathing. Even if you wear a mask inside -USER Manual B1: Peel off 2 layers of protective film to protect the glass (CUSTOMERS ATTENTION TWO CLASSES OF NILONG TWO-SIDE BEFORE USE, NO HAIR WILL BE VERY HAPPY) B2: Turn the latch lever of the frame and put the glasses in and close the latch at 2 pin holes. B3: Complete and use assembly. After using alcohol or antiseptic water to clean the surface. ———————