Firefly Thriller Blue Plug from NS Novelties. Firefly Glow in the Dark pleasure plugs are made of flexible, odorless, body safe Thermoplastic Elastomers TPE. Available in assorted shapes, colors and sizes. UPC 657447102301. Product dimensions 4.53 inches by 2.76 inches by 1.06 inches.Package dimensions 8.11 inches by 3.98 inches by 1.22 inches. Packaged weight 1.30 ounces.Product material Thermoplastic Elastomers TPE.