Light up your night rides with Bike Balls Cycling Red Tailgate Safety Light. You'll enjoy comments from strangers like "Nice Balls!" and you're sure to be seen by motorists keeping you safe at night. Three(3) light modes: Solid, Fast Blink, Slow Blink. Silicone exterior is weatherproof and super stretchy allowing it to fit on all bike seats. Hang em' to the left or right... it's up to you!