The knife glows in the dark after being exposed to light. Great for pretend play or a finishing touch on a costume. Kids will love this for Halloween costume and Mom's will love the fact that it will glow at night and make your child stand out. Find the best Halloween costume accessories at the best prices. We have a wide selection of make-believe weapons including swords, daggers, axes, ace and more. You'll find the perfect weapon to complete your Halloween costume. Inspire creativity in children with dress up or pretend play games using our wide range of costume accessories.