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【Size】: pen refill-13x0.4cm/5x0.2'', pen shell-14.5x1cm/5.7x0.4''. 4 pieces disappearing light yellow ink marking pen with 20 pieces fabric refills,

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Specifications:, This fine point marker, is loaded with special ink that is only visible under UV light., It includes a mini UV light, so you can view

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As a detective, you always need the right tools when you are on the hunt for evidence or reading secret messages. Ultraviolet light helps you uncover many hidden clues. Exchange top secret info with your friends and fellow agents using this high-tech device. The pen uses a special ink that only becomes visible under ultraviolet light, like the one emitted by the flashlight on its opposite end. You can also use the UV light to find other objects and materials that glow.

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Kids will love playing spy games with these invisible ink spy pens. The pens come with safe and non-toxic invisible ink that can only be seen when you shine UV light from the cap of the pen on it. Write secret messages on paper, T-shirts, your skin, or just about any hard surface. The ink is permanent yet washable and flavorless. Makes great party favors, UV light comes with batteries. Pens are approximately 5.5 inches long. Write secret messages with our spy pens.

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