Perhaps you're used to seeing these balls at the gym, but you could never do with those pieces of exercise equipment what you can do with the E-Z Rider Rocker Ball. Hop on for a ride you'll never forget - quite unlike the monotony of your ball routine at the fitness center! This round, bouncy, yet stable inflatable ball features a Vac-U-Lock plug for any of your compatible sex toy attachments. Lock-in your favorite dildo or dong and roll around for unbeatable sexual pleasure.