Using these sheets is a breeze. Just put the fitted sheet on your king - sized 40cm deep bed. The tags on the sheet will help you place it correctly. Then, slip your pillows into the pillowcases. For washing, use a gentle cycle with mild detergent. You can wash them in warm water, but avoid using bleach as it might damage the cotton. After washing, tumble dry on low heat. These sheets are very durable, but it's still a good idea to check for any loose threads or small damages regularly. If you find any, you can mend them easily with a needle and thread. With proper care, these sheets will last you a long time and keep providing you with a comfortable sleep.