Using these sheets is easy. Just put the fitted sheet on your long single 40 - cm bed by matching the tags on the corners to the right spots. Then place the pillowcases on your pillows. When it comes to washing, use a gentle cycle with mild detergent. Don't use bleach as it can damage the fabric. You can tumble dry on low heat, but take them out promptly to avoid wrinkles. To keep them in great shape, wash them regularly, and store them in a cool, dry place when not in use.