Using these sheets is a breeze. Just put the fitted sheet on your king single bed (50cm), making sure the tags help you place it correctly. Then add the pillowcases to your pillows. For best results, wash these sheets in cold or warm water with a mild detergent. Avoid using bleach as it can damage the cotton. Tumble dry on a low setting. These sheets are very durable, but to keep them looking great, don't over - dry them. With proper care, they'll provide you with many nights of comfortable sleep.