About the material that is easy to peel off, so it is perfect for windows, plastic, and smooth appliances and doors, etc. (This highly functional wallpaper has been treated to be sanded walls, earthen walls, and soil-proof, so it is easy to peel off. About how to see the colors: This product is printed on transparent sheets, so please enjoy it on white or light colored walls. When applied to black or dark colored walls, the color will sink and will not show the original design. In addition, the color may be slightly transparent when applied to glass where light is hitten. ●Regarding exchanges/returns the image is a sample image, so colors may appear different depending on viewing environment. Exchanges or refunds cannot be accepted for reasons such as a difference in color between the product image and actual product. Returns and exchanges for reasons other than defects in product will not be accepted as products are manufactured to order.