Using these sheets is a breeze. First, place the fitted sheet on your single 40cm bed. The tags on each side will help you make sure it's correctly positioned. Then, slip your pillows into the pillowcases. For washing, use a gentle cycle with mild detergent in warm water. Avoid using bleach as it can damage the fabric. After washing, tumble dry on low heat to maintain the softness and shape of the sheets. If you notice any wrinkles, a low - iron setting can be used. With proper care, these sheets will serve you well for a long time.