Firefly Pleasure Plug Small Blue. Illuminate all your under the covers fun! Soft and comfortable to use, these tapered butt plugs are body safe and easy to receive. Available in three bright colors and three graduated sizes, these sexy glowing plugs will turn you on when the lights are off. Made of odorless materials. Suitable for all lubricants. Butt plug dimensions 4 inches by 1.7 inches. Product material Thermoplastic Elastomers TPE.