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It can stretch like rubber and bounce like a ball, and because it's silicone-based, it won't dry out or crumble over time. It's part toy, part stress reliever, part physical therapy and entirely addictive.Monster is an eerie glow-in-the-dark putty that's sure to make you scream with delight. Use a flashlight to charge your putty, and then let its glow enhance the telling of your favorite ghost stories