Dr. Joel Kaplan Anal Exerciser Kit includes a set of 3 progressively sized, pliable and durable tapered probes. Features a oversized and angled suction cup base. Made from TPR. Beginner probe: 3.5″ X 1″. Intermediate probe: 4.5″ X 1.25″. Advanced probe: 5.5″ X 1.5″.