Three piece kit is harness compatible Small dong is 5.5 (14 cm) x 1.5 (3.8 cm) for gentle exploration Medium dong is 7 (17.8 cm) x 1.75 (4.5 cm) for powerful sensations Large dong is 8.5 (21.6 cm) x 2 (5 cm) for deep and intense play Suction bases provide a secure grip and easy control when attached to a smooth flat surface Comfortable, durable SensaFirm is easy to clean and slippery when lubricated