Who knew spiders could glow-in-the-dark? A creepy crawly addition to your Halloween party supplies, these Glow-in-the-Dark Spiders can be used for all kinds of spooky things! Set them around your house with the rest of your Halloween decorations, or give them away as party favors at your school’s costume party. Plastic. (50 pcs. per unit) 2 1/2" x 1 1/4" Expose items to daylight to activate glow.