This is a set of two 100g bags of magnesium with a purity of 99.95% or higher. It is double-stitched with thick thread. Washing for 15 minutes and rinsing once saves water. Soaking in citric acid about once every three months will remove the film that forms from washing. Soak for a short time, as prolonged soaking can dissolve the magnesium. It is said to be usable 300 times, or about 1 year, but if you wish, we can embroider the shipping date and send it to you. 100g is the recommended amount for 5kg of laundry. When magnesium mixes with water, it changes into weakly alkaline water containing hydrogen. Weakly alkaline water has antibacterial, cleaning, and deodorizing effects. You can also use it in the bath for hydrogen bathing, and the remainder can be scattered on the soil to make the soil alkaline and invigorate plants. It is suitable for indoor drying and organic cotton. Please do not use it on silk, wool, cashmere, etc. Fabric softener is not necessary, but you can use it if you prefer. For acidic stains, please add detergent. Chlorine bleach cannot be used. Do not touch with bare hands. Do not use for drinking. We will send it to you tied flat.