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The knife is a potential danger in domestic life. People sometimes leave it aside to deal with other things, if children or the elder touch the knife, they may injure themselves. Despite some knives could be folded, you also might forget to fold them, the exposed knife-edge will be the menace to your families. Yoga-knife is based on the concept of the yoga. The material of its sheath is soft and flexible. When using, to bend the sheath to the hilt, revealing the knife-edge, then as soon as you loosen, the sheath will restore to the original shape, thus even you are careless, you neednt to worry about the potential danger of the sharp blade.