Onyx Dual Open Ended Penis TrainerPush your stamina and pleasure to the next level with Onyx, the sleek open ended vibrating trainer built for both performance and play. With a jelly soft sleeve that hugs every inch and 10 modes of dual bullet vibration, Onyx is designed to strengthen endurance while delivering toe curling stimulation. It's dual open ended design allows for natural movement, easy cleaning, and versatility whether for solo training or adding a spark with a partner.