This 3d fidget knife is the best gravity knife toy ever, kids and aduat love them! kids can play it all day, it's relieves your stress. Quality and very sturdy and have nice colors. The gravity knife design adds an element of surprise and fun to the fidgeting experience. The toy can be unfolded and folded back using gravity, creating an interactive and enjoyable way to fidget. They are quite durable and super fun.you can carry one everywhere you go. Newly Designed Stress Relief Tools Help Children Relieve Stress Whether you are a student or an office worker, regardless of age, this set of fidget toy knives can relieve your worry and stress, give it a try!