Fleshlight Stamina Training Unit. Features: the number 1 best selling model. Safely train to improve sexual performance and last longer. Sleeve texture designed to replicate actual intercourse. High quality, patented SuperSkin material made in the USA. Sleeve is non-toxic and phthalate free. Patented case design creates variable suction with simple end cap adjustment. Easy to prepare and clean. Long lasting, durable construction. The key to lasting longer in bed and becoming the lover that every girl dreams about is not a cream, not a pill, and not a potion. It is practice. The Fleshlight Stamina Training Unit STU masturbation product is a sex toy for men specifically designed to replicate the incredible sensation of sexual intercourse in order to help you find your rhythm and obtain peak sexual performance. Full unit measures 10 inches long and 4 inches in diameter. New model image.