Dr Joel Anal Exerciser Kit. Set of 3 progressively sized, pliable and durable tapered probesOver sized, angled suction cup base. Safe and pure for body and pleasure made using phthalate free materials Thermoplastic Rubber TPR. 3.5 inches by 1 inch beginner probe.4.5 inches by 1.25 inches intermediate probe. 5.5 inches by 1.5 inches advanced probe.