This is not a real knife, it is a practice version of a butterfly knife / balisong (a pocket knife with two handles which rotate in such a way that the blade is concealed within the handles). It has a dull-edged blade and so is intended for practice and training purposes only.
Black Butterfly Balisong Trainer Knife Training Dull Tool Metal Practice
[User-Friendly Material] - Plastic butterfly integral channel handle provides a sturdy and child-friendly design. The use of lightweight yet strong
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Butterfly Knife Balisong Metal Folding Practice Training Toy Gift Free Shipping
3 PACK Butterfly Knife Trainer with spanner, Butterfly Steel Trainer Knife Folding Knife for Practicing Flipping Tricks - no Offensive Blade Unsharpened Blade - for Beginner, Butterfly Knives Lover : Sports & Outdoors