Using these curtains is easy - just hang them up in your room to enjoy their 3D decoration and sunlight - blocking benefits. When it's time to wash them, make sure to separate the dark - colored and light - colored curtains to avoid color bleeding. Machine wash them in cold water on a gentle cycle, and keep the water temperature below 30°C. Don't worry about the ±3 cm size error as it won't impact how they fit. Each set comes with two panels, so you can arrange them as you like. Be aware that there may be a small color difference between what you see on your screen and the actual product because of monitor variations.