Firefly Fantasy Extension Sleeve Large Blue from NS Novelties. Add inches and add excitement to your love life with Fireflys glow in the dark penis sleeve. Made of odorless, body safe Thermoplastic Elastomers TPE, this super stretchy extension is designed to enhance user and partners pleasure. Available in assorted sizes. Suitable with all lubricants. Product bulk weight 9.10 ounces. Product dimensions 9.17 inches by 2.36 inches by 2.17 inches. Package dimensions 12.05 inches by 3.58 inches by 2.68 inches. Insertable dimensions 6.57 inches by 1.97 inches. Product material Thermoplastic Elastomers TPE.