This is a set of two containing 100g each of high-purity magnesium, 99.9% or more. It's double-stitched with thick thread. Washing takes 15 minutes, and rinsing once, saving water. Soak in citric acid about once every three months to remove the film that forms during washing. Leave it for a short time, as prolonged soaking will dissolve the magnesium. It's said to last for 300 washes, about a year, but if you wish, we can embroider the date of dispatch. 100g is the guideline 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 a hydrogen bath, and the remainder can be spread on the soil, making the soil alkaline and revitalizing plants. Suitable for indoor drying and organic cotton. Do not use on silk, wool, or cashmere. Fabric softener is not required, but you can add it if you like. Add detergent for acidic stains. Do not use chlorine bleach. Do not touch with bare hands. Do not use for drinking. We will send it tied flat.